RFC 3108
Conventions for the use of the Session Description Protocol (SDP) for ATM Bearer Connections
6. List of Parameters with Representations
This section provides a list of the parameters used in this document, and the formats used to represent them in SDP descriptions. In general, a "-" value can be used for any field that is not specified, is inapplicable or is implied. PARAMETER MEANING REPRESENTATION <username> User name Constant "-" <sessionID> Session ID Up to 32 decimal or hex digits <version> Version of "0" or 10 decimal digits SDP descriptor <networkType> Network type Constant "ATM" for ATM transport <addressType> Address type String values: "NSAP", "E164", "GWID", "ALIAS" <address> Address "NSAP": 40 hex digits, dotted "E164": up to 15 decimal digits "GWID": up to 32 characters "ALIAS": up to 32 characters <sessionName> Session name Constant "-" <startTime> Session start "0" or 10 decimal digits time <stopTime> Session stop Constant "0" time <vcci> Virtual Circuit Decimal or hex equivalent Connection of 16 bits Identifier <ex_vcci> Explicit "VCCI-" prefixed to <vcci> representation of <vcci> <bcg> Bearer Connection Decimal or hex equivalent Group of 8 bits
<ex_bcg> Explicit "BCG-" prefixed to <bcg>
representation
of <bcg>
<portId> Port ID Hex number of up to 32 digits
<ex_portId> Explicit "PORT-" prefixed to <portId>
representation
of <portId>
<vpi> Virtual Path Decimal or hex equivalent
Identifier of 8 or 12 bits
<ex_vpi> Explicit "VPI-" prefixed to <vpi>
representation
of <vpi>
<vci> Virtual Circui t Decimal or hex equivalent
Identifier of 16 bits
<ex_vci> Explicit "VCI-" prefixed to <vci>
representation
of <vci>
<vpci> Virtual Path Decimal or hex equivalent
Connection of 16 bits
Identifier
<ex_vpci> Explicit "VPCI-" prefixed to <vpci>
representation
of <vpci>
<cid> Channel Decimal or hex equivalent
Identifier of 8 bits
<ex_cid> Explicit "CID-" prefixed to <cid>
representation
of <cid>
<payloadType> Payload Decimal integer 0-127
Type
<transport> Transport Values listed in
Table 1.
<profile> Profile Decimal integer 1-255
<eecid> End-to-end Up to 8 hex digits
Connection
Identifier
<aalType> AAL type String values:
"AAL1","AAL1_SDT","AAL1_UDT",
"AAL2", "AAL3/4",
"AAL5", "USER_DEFINED_AAL"
<asc> ATM service String values:
category defined "CBR", "nrt-VBR", "rt-VBR",
by the ATMF "UBR", "ABR", "GFR"
<atc> ATM transfer String values:
capability "DBR","SBR","ABT/IT","ABT/DT",
defined by the "ABR"
ITU
<subtype> <asc>/<atc> Decimal integer 1-10
subtype
<qosClass> QoS Class Decimal integer 0-5
<bcob> Broadband Bearer Decimal or hex representation
Class of 5-bit field
<eetim> End-to-end timing String values: "on",
required "off".
<stc> Susceptibility Decimal equivalent of
to clipping a 2-bit field
<upcc> User plane Decimal equivalent of
connection a 2-bit field
configuration
<directionFlag> Direction Flag String values: "f", "b",
"fb"
<cdvType> CDV type String values:
"PP", "2P"
<acdv> Acceptable CDV Decimal equivalent
of 24-bit field
<ccdv> Cumulative CDV Decimal equivalent
of 24-bit field
<eetd> End-to-end transit Decimal equivalent
delay of 16-bit field
<cmtd> Cumulative transit Decimal equivalent
delay of 16-bit field
<aclr> Acceptable Decimal equivalent
Cell Loss Ratio of 8-bit field
<clpLvl> CLP level String values:
"0", "0+1"
<pcr> Peak Decimal
Cell Rate equivalent of a 24-bit field.
<scr> Sustained Decimal
Cell Rate equivalent of a 24-bit field
<mbs> Maximum Decimal
Burst Size equivalent of 16-bit field
<cdvt> CDVT Decimal equivalent of 24-bit
field.
<mcr> Minimum Decimal
Cell Rate equivalent of a 24-bit field
<mfs> Maximum Decimal
Frame Size equivalent of a 16-bit field
<fd> Frame Discard String Values:
Allowed "on", "off"
<te> CLP tagging String Values:
"on", "off"
<nrm> NRM Decimal/hex equivalent
of 3 bit field
<trm> TRM -ditto-
<cdf> CDF -ditto-
<adtf> ADTF Decimal/Hex equivalent
of 10 bit field
<ficr> Forward Initial Decimal equivalent of
Cell Rate 24-bit field
<bicr> Backward Initial Decimal equivalent of
Cell Rate 24-bit field
<ftbe> Forward Transient Decimal equivalent of
Buffer Exposure 24-bit field
<btbe> Backward Transient Decimal equivalent of
Buffer Exposure 24-bit field
<crmrtt> Cumulative RM Decimal equivalent of
round-trip time 24-bit field
(Microseconds)
<frif> Forward rate Decimal integer
increase factor 0 -15
<brif> Backward rate Decimal integer
increase factor 0 -15
<frdf> Forward rate Decimal integer
decrease factor 0 -15
<brdf> Backward rate Decimal integer
decrease factor 0 -15
<bearerType> Bearer Type String Values:
"PVC", "SVC", "CID"
<localInitiation> Local Initiation String values:
"on", "off"
<sci> Screening Indication Decimal or hex
equivalent of 4 bits.
<lsn> Leaf Sequence Number Decimal or hex
equivalent of 32 bits.
<cdStd> Coding standard for Decimal or hex
connection scope equivalent of 2 bits.
selection IE
Definition: UNI 4.0 [5]
<conScpTyp> Type of connection scope Decimal or hex
Definition: UNI 4.0 [5] equivalent of 4 bits
<conScpSel> Connection scope selection Decimal or hex
Definition: UNI 4.0 [5] equivalent of 8 bits
<cacheEnable> Enable SVC caching String values: "on",
"off"
<cacheTimer> Timer for cached SVC Decimal or hex equivalent
deletion of 32-bit field
<bearerSigIEType> Bearer Signaling IE Type 2 hex digits
<bearerSigIELng> Bearer Signaling IE Length 1-4 hex digits
<bearerSigIEVal> Bearer Signaling IE Value Even number of hex
digits, 2-512
<appClass> Application String values:
specification "itu_h323c","af83",
"AAL5_SSCOP",
"itu_i3661_unassured",
"itu_i3661_assured",
"itu_i3662",
"itu_i3651", "itu_i3652",
"itu_i3653", "itu_i3654",
"FRF5", "FRF8","FRF11",
"itu_h2221"
<oui> Organizationally 1 to 6 hex digits
Unique Identifier
<appId> Application Identifier 1 to 8 digits
<cbrRate> CBR Rate Two hex digits.
<sbc> Subchannel Count T1: Decimal integer 1-24
or hex equivalent
E1: Decimal integer 1-31
or hex equivalent
<clkrec> Clock Recovery String values:
Method "NULL", "SRTS",
"ADAPTIVE"
<fecEnable> Forward Error String values:
Correction Enable "NULL", "LOSS_SENSITIVE"
"DELAY_SENSITIVE"
<partialFill> Partial Fill Decimal integer 1-48
or hex equivalent
<structureEnable> Structure Present String values:
"on", "off"
<blksz> Block Size Decimal or hexadecimal
equivalent of 16 bits
<cpcs> Maximum AAL5: Decimal or hex
CPCS SDU size equivalent of 16 bits
AAL2: 45 or 64, decimal
or hex representation
<cidLowerLimit> AAL2 CID lower limit Decimal integer 8-255
or hex equivalent
<cidUpperLimit> AAL2 CID upper limit Decimal integer 8-255
or hex equivalent
<timerCU> Timer, combined use Integer decimal; range
(microseconds) determined by application.
Use decimal equivalent of
32 bits.
<simplifiedCPS> Simplified CPS [52] String values:
"on", "off"
<fSDUrate> Forward SDU rate Decimal equivalent of
(bits per second) 24-bit field
<bSDUrate> Backward SDU rate Decimal equivalent of
(bits per second) 24-bit field
<ted> Transmission Error String values:
Detection Enable "on", "off"
<rastimer> SSSAR reassembly Integer decimal,
(microseconds) Range determined by
application. Use decimal
equivalent of 32 bits.
<fsssar> Maximum SSSAR-SDU Decimal 1- 65568
size, forward or hex equivalent
direction
<bsssar> Maximum SSSAR-SDU Decimal 1- 65568
size, backward or hex equivalent
direction
<fsscopsdu> Maximum SSCOP-SDU Decimal 1- 65528
size, forward or hex equivalent
direction
<bsscopsdu> Maximum SSCOP-SDU Decimal 1- 65528
size, backward or hex equivalent
direction
<fsscopuu> Maximum SSCOP-UU Decimal 1- 65524
field size, forward or hex equivalent
direction
<bsscopuu> Maximum SSCOP-UU Decimal 1- 65524
field size, backward or hex equivalent
direction
<sap> Service Access String values:
Point "AUDIO", "MULTIRATE"
<circuitMode> Circuit Mode String values:
Enable "on", "off"
<frameMode> Frame Mode String values:
Enable "on", "off"
<faxDemod> Fax Demodulation String values:
Enable "on", "off"
<cas> Enable CAS transport String values:
via Type 3 packets "on", "off"
<dtmf> Enable DTMF transport String values:
via Type 3 packets "on", "off"
<mfall> Enable MF transport String values:
via Type 3 packets "on", "off"
<mfr1> Enable MF (R1) String values:
transport via "on", "off"
Type 3 packets
<mfr2> Enable MF (R2) String values:
transport via "on", "off"
Type 3 packets
<PCMencoding> PCM encoding String values:
"PCMA", "PCMU"
<fmaxFrame> Maximum length of a Decimal or hex
frame mode data unit, equivalent of
forward direction 16-bit field
<bmaxFrame> Maximum length of a -ditto-
frame mode data unit,
backward direction
<silenceSuppEnable> Silence suppression String values:
Enable "on", "off"
<silenceTimer> Kick-in timer Decimal or hex representation
for silence of 16-bit field
suppression
<suppPref> Preferred Silence String values:
Suppression Method "standard", "custom"
<sidUse> SID Use String values:
Method "No SID", "Fixed Noise",
"Sampled Noise"
<fxnslevel> Fixed Noise Decimal or hex representation
Level of a 7-bit field
<ecanEnable> Enable Echo String values:
Cancellation "on", "off"
<ecanType> Type of Echo String values:
Cancellation "G165", "G168"
<gcEnable> Enable Gain String values:
Control "on", "off"
<gcLvl> Level of inserted Decimal or hex equivalent
Loss of 16-bit field
<aal2transport> AAL2 transport Values listed in Table 1
that begin with the string
"AAL2"
<uuiCodeRange> UUI code range Decimal integer 0-15
<encodingName> Encoding name String values:
"PCMG", "SIDG", "SID729",
any value from column 2
of Table 2
<packetLength> Packet length Decimal integer 0-45
<packetTime> Packetization Decimal integer 1-65,536
Interval in microsec.
<fxIncl> Facsimile included String values: "on", "off"
<serviceType> Service type String values: "v", "d", "f",
"df", "all"
<q7655scc> Contents of the Even number of hex
Q.765.5 Single digits (4-32)
Codec IE
<isupUsi> ISUP User Service Even number of hex digits
Information (4-24)
<uiLayer1Prot> User Information Two hex digits
Layer 1 Protocol
<chainPointer> Chain pointer String values: "NEXT",
"PREVIOUS", "NULL"
<rtcpPortNum> RTCP port number for Odd decimal in range 1,024 to
H.323 Annex C 65,535.
applications Preferred: Odd number in
the range 49,152 to 65,535
<rtcpIPaddr> IP address for receipt Dotted decimal, 7-15 chars
of RTCP packets
7. Examples of ATM session descriptions using SDP
An example of a complete AAL1 session description in SDP is: v=0 o=- A3C47F21456789F0 0 ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 s=- c=ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 t=0 0 m=audio $ AAL1/AVP 18 0 96 a=atmmap:96 X-G727-32 a=eecid:B3D58E32 An example of a complete AAL2 session description in SDP is: v=0 o=- A3C47F21456789F0 0 ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 s=- c=ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 t=0 0 m=audio $ AAL2/ITU 8 AAL2/custom 100 AAL2/ITU 1 a=eecid:B3E32 The AAL2 session descriptor below is the same as the one above except that it states an explicit preference for a voice codec, a voiceband data codec and a voiceband fax codec. Further, it defines the profile AAL2/custom 100 rather than assume that the far-end is cognizant of the elements of this profile. v=0 o=- A3C47F21456789F0 0 ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 s=- c=ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00 t=0 0 m=audio $ AAL2/ITU 8 AAL2/custom 100 AAL2/ITU 1 a=eecid:B3E32 a=profileDesc:AAL2/custom 100 0-7 PCMG 40 5000 0-7 SIDG 1 5000 8-15 G726-32 40 10000 8-15 SIDG 1 5000 a=vsel:G726-32 40 10000 a=dsel:off PCMU - - a=fsel:G726-32 40 10000
An example of an SDP session descriptor for an AAL5 switched virtual
circuit for delivering MPEG-2 video:
v=0
o=- A3C47F21456789F0 0 ATM NSAP
47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00
s=-
c=ATM NSAP 47.0091.8100.0000.0060.3e64.fd01.0060.3e64.fd01.00
t=0 0
m=video $ AAL5/ITU 33
a=eecid:B3E32
a=aalType:AAL5
a=bearerType:SVC on
a=atmTrfcDesc:f 0+1 7816 - - - - - off -
a=atmTrfcDesc:b 0+1 0 - - - - - on -
a=cpsSDUsize:f 20680
a=aalApp:itu_h2221 - -
An example of an SDP session descriptor for an AAL5 permanent virtual
circuit for delivering MPEG-2 video:
v=0
o=- A3C47F21456789F0 0 ATM - -
s=-
c=ATM - -
t=0 0
m=video PORT-$/VPI-0/VCI-$ AAL5/ITU 33
a=bearerType:PVC -
a=atmTrfcDesc:f 0+1 7816 - - - - - off -
a=atmTrfcDesc:b 0+1 0 - - - - - on -
a=cpsSDUsize:f 20680
a=aalApp:itu_h2221 - -
8. Security Considerations
8.1 Bearer Security
At present, standard means of encrypting ATM and AAL2 bearers are not
conventionalized in the same manner as means of encrypting RTP
payloads. Nor has the authentication of ATM or AAL2 bearer
signaling.
The SDP encryption key line (k=) defined in RFC 2327 can be used to
represent the encryption key and the method of obtaining the key. In
the ATM and AAL2 contexts, the term 'bearer' can include 'bearer
signaling' as well as 'bearer payloads'.
8.2 Security of the SDP description
The SDP session descriptions might originate in untrusted areas such as equipment owned by end-subscribers or located at end-subscriber premises. SDP relies on the security mechanisms of the encapsulating protocol or layers below the encapsulating protocol. Examples of encapsulating protocols are the Session Initiation Protocol (SIP), MGCP and Multimedia Gateway Control Protocol (MEGACO). No additional security mechanisms are needed. SIP, MGCP and MEGACO can use IPSec authentication as described in RFC 1826 [Ref. 27]. IPSec encryption can be optionally used with authentication to provide an additional, potentially more expensive level of security. IPSec security associations can be made between equipment located in untrusted areas and equipment located in trusted areas through configured shared secrets or the use of a certificate authority.9. ATM SDP Grammar
This appendix provides an Augmented BNF (ABNF) grammar for the ATM conventions for SDP. ABNF is defined in rfc2234. This is not a complete ABNF description of SDP. Readers are referred to [1] for an ABNF description of the SDP base line protocol, and to rfc2848, rfc2543, rfc2045 and rfc2326 for application-specific conventions for SDP use. For case conventions, see section 2.4. ; Constant definitions safe = alpha-numeric / "'" / "-" / "." / "/" / ":" / "?" / DQUOTE / "#" / "$" / "&" / "*" / ";" / "=" / "@" / "[" / "]" / "^" / "_" / "`" / "{" / "|" / "}" / "+" / "~" DQUOTE = %x22 ; double quote alpha-numeric = ALPHA / DIGIT ALPHA = "a" / "b" / "c" / "d" / "e" / "f" / "g" / "h" / "i" / "j" / "k" / "l" / "m" / "n" / "o" / "p" / "q" / "r" / "s" / "t" / "u" / "v" / "w" / "x" / "y" / "z" / "A" / "B" / "C" / "D" / "E" / "F" / "G" / "H" / "I" / "J" / "K" / "L" / "M" / "N" / "O" / "P" / "Q" / "R" / "S" / "T" / "U" / "V" / "W" / "X" / "Y" / "Z" DIGIT = "0" / POS-DIGIT POS-DIGIT = "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9" hex-prefix = "0" ("x" / "X") HEXDIG = DIGIT / "a" / "b" / "c" / "d" / "e" / "f" / "A" / "B" / "C" / "D" / "E" / "F" space = %d32 EOL = (CR / LF / CRLF) ; as per Megaco RFC CR = %d13 LF = %d10
decimal-uchar = DIGIT
/ POS-DIGIT DIGIT
/ ("1" 2*(DIGIT))
/ ("2" ("0"/"1"/"2"/"3"/"4") DIGIT)
/ ("2" "5" ("0"/"1"/"2"/"3"/"4"/"5"))
generic-U8 = (hex-prefix hex-U8) / decimal-uchar
generic-U12 = (hex-prefix hex-U12) / 1*4 (DIGIT)
generic-U16 = (hex-prefix hex-U16) / 1*5(DIGIT)
generic-U24 = (hex-prefix hex-U24) / 1*8(DIGIT)
generic-U32 = (hex-prefix hex-U32) / 1*10(DIGIT)
hex-U8 = 1*2(HEXDIG)
hex-U12 = 1*3(HEXDIG)
hex-U16 = 1*4(HEXDIG)
hex-U24 = 1*6(HEXDIG)
hex-U32 = 1*8(HEXDIG)
generic-U8-or-null = generic-U8 / "-"
generic-U12-or-null = generic-U12 / "-"
generic-U16-or-null = generic-U16 / "-"
generic-U24-or-null = generic-U24 / "-"
generic-U32-or-null = generic-U32 / "-"
decimal-U8-or-null = decimal-uchar / "-"
decimal-U12-or-null = 1*4(DIGIT) / "-"
decimal-U16-or-null = 1*5(DIGIT) / "-"
decimal-U24-or-null = 1*8 (DIGIT) / "-"
decimal-U32-or-null = 1*10(DIGIT) / "-"
on-off-or-null = "on" / "off" / "-"
; ABNF definition of SDP with ATM conventions
SDP-infoset = 1*(announcement)announcement = proto-version
origin-field session-name-field information-field uri-field
email-fields phone-fields connection-field bandwidth-fields
time-fields key-field attribute-fields media-descriptions
proto-version = ["v=" 1*4(DIGIT) EOL] ; use "v=0" for ATM SDP
origin-field = ["o=" username space sess-id space sess-version space
net-type-addr EOL]
username = 1* safe ; for ATM use "-"
sess-id = (1*32 DIGIT) / (hex-prefix 1*32 HEXDIG)
sess-version = (1*10 DIGIT) / (hex-prefix 1*8 HEXDIG)
net-type-addr= nettype space addrtype-addr
netttype = "ATM" / "IN" / "TN" / "-" / "$"
; Other nettype values may be defined in the future in other documents
; Validity of nettype and addrtype-addr combination to be checked at
; application level, not protocol syntax level
addrtype-addr = atm-addrtype-addr / ip-addrtype-addr / tn-addrtype-addr
; ip-addrtype-addr per rfc2327
; tn-addrtype-addr per rfc2848
; ATM address definition
atm-addrtype-addr = atm-nsap-addr / atm-e164-addr / atm-alias-addr
atm-nsap-addr = ("NSAP" / "-" / "$") space (nsap-addr / "-" / "$")
atm-e164-addr = ("E164" / "-" / "$") space (e164-addr / "-" / "$")
atm-alias-addr = ("GWID" / "ALIAS" / "-" / "$") space (alias-addr /
"-" / "$")
nsap-addr = 2(HEXDIG) "." 9(4(HEXDIG) ".") 2(HEXDIG)
e164-addr = 1*15 (DIGIT)
alias-addr = 1*32(alpha-numeric / "-" / "." / "_")
session-name-field = ["s=" text EOL] ; for ATM use "s=-"
text = byte-string
byte-string = 1*(byte-string-char) ; definition per rfc2327
byte-string-char = %x01-09/ %x0B/ %x0C/ %x0E-FF ; all ASCII except
NUL, CR & LF
; Definitions of information-field, uri-field, email-fields,
; phone-fields per rfc2327. These fields are omitted in
; ATM SDP descriptions. If received, they are ignored in the ATM
; context
connection-field = ["c=" c-net-type-addr]
; connection-field required, not optional, in ATM
c-net-type-addr = nettype space c-addrtype-addr
c-addrtype-addr = atm-addrtype-addr / c-ip-addrtype-addr /
tn-addrtype-addr
; atm-addrtype-addr defined above
; c-ip-addrtype-addr per rfc2327
; difference in address usage between 'o' and 'c' lines per rfc2327
; tn-addrtype-addr per rfc2848
bandwidth-fields = *("b=" bwtype ":" bandwidth EOL)
bwtype = 1*(alpha-numeric)
bandwidth = 1*(DIGIT)
time-fields = *( "t=" start-time space stop-time
*(EOL repeat-fields) EOL)
[zone-adjustments EOL]
start-time = time / "0"
stop-time = time / "0" ; always "0" in ATM
time = POS-DIGIT 9*(DIGIT) ; same as rfc2327
; repeat-fields and zone-adjustments per rfc2327, not used in ATM
; Definition of optional key-field per rfc2327
;
attribute-fields = *("a=" attribute EOL)
; SDP descriptors for ATM do not have session-level media attribute
; lines. If these are provided, they should be ignored.
media-descriptions = *(media-description)
media-description = media-field information-field *(connection-field)
bandwidth-fields key-field attribute-fields
; Definitions of information-field per RFC 2327. These fields are
; omitted in ATM SDP descriptions. If received, they are ignored in
; the ATM context
;
; In ATM, the connection-field is used in media-description to indicate
; the IP address associated with the RTCP control protocol in H.323.C
; applications. In this case, the connection field is per the RFC 2327
; definition for IP v4-based connections. Otherwise, it is not used in
; media-description. If received as part of media-description,
; it is ignored.
;
; Definition of optional bandwidth-fields as above.
: Definition of optional key-field as in RFC 2327
media-field = rfc2327-media-field / rfc2848-media-field /
atm-media-field
; rfc2327-media-field and rfc2848-media-field defined in those rfc's
atm-media-field = "m=" media space vcId space transport-fmts EOL
; superset of rfc2327 definition
media = "audio" / "video" / "data" / "application" / "control" /
1*(alpha-numeric)
vcId = "$" / "-" / ex-vcci / (ex-vcci "/" ex-cid) /
(atm-type-addr-m "/" ex-vcci) /
(atm-type-addr-m "/" ex-vcci "/" ex-cid) /
(ex-bcg "/" ex-vcci) / (ex-bcg "/" ex-vcci "/" ex-cid)
(ex-portid "/" ex-vpi "/" ex-vci) /
(ex-portid "/" ex-vpi "/" ex-vci "/" ex-cid) /
(ex-bcg "/" ex-vpi "/" ex-vci) /
(ex-bcg "/" ex-vpi "/" ex-vci "/" ex-cid) /
(ex-vpci "/" ex-vci) /
(ex-vpci "/" ex-vci "/" ex-cid) /
(atm-type-addr-m "/" ex-vpci "/" ex-vci) /
(atm-type-addr-m "/" ex-vpci "/" ex-vci "/" ex-cid)
atm-type-addr-m = atm-nsap-addr-m / atm-e164-addr-m / atm-alias-addr-m
atm-nsap-addr-m = ["NSAP-"] (nsap-addr / "$")
atm-e164-addr-m = ["E164-"] (e164-addr / "$")
atm-alias-addr-m = ["GWID-" / "ALIAS-"] (alias-addr / "$")
; The -m at the end indicates use in the media field
; Wildcarding rules different from ATM address on 'o' and 'c' lines
ex-vcci = "VCCI-" vcci
ex-cid = "CID-" cid
ex-bcg = "BCG-" bcg
ex-portid = "PORT-" portid
ex-vpi = "VPI-" vpi
ex-vci = "VCI-" vci
ex-vpci = "VPCI-" vpci
vcci = generic-U16
cid = generic-U8
bcg = generic-U8
portid = 1*32 (HEXDIG)
vpi = generic-U12
vci = generic-U16
vpci = generic-U16
transport-fmts = generic-transport-fmts / known-transport-fmts / "- -"
generic-transport-fmts = generic-transport 1*(space fmt)
generic-transport = 1*(alpha-numeric / "/")
fmt = 1*(alpha-numeric)
known-transport-fmts = aal1-transport space aal1-fmt-list /
aal2-transport space aal2-fmt-list
*(space aal2-transport space aal2-fmt-list) /
aal5-transport space aal5-fmt-list /
rtp-transport space rtp-fmt-list /
tn-proto space tn-fmt-list /
h323c-proto "-"
h323c-proto = "H323c"
; h323c-proto used for RTCP control ports in H.323 annex C
; applications. tn-proto and tn-fmt-list per rfc2848
aal1-transport = "AAL1" "/" aal1-transport-list
aal1-transport-list = "ATMF" / "ITU" / "custom" / "IEEE:" oui /
corporate-name
corporate-name = 1*(safe)
aal2-transport = "AAL2" "/" aal2-transport-list
aal2-transport-list = aal1-transport-list
aal5-transport = "AAL5" "/" aal5-transport-list
aal5-transport-list = aal1-transport-list
rtp-transport = "RTP" "/" rtp-transport-list
rtp-transport-list = "AVP"
aal1-fmt-list = (payload-type *(space payload-type)) / "-"
payload-type = decimal-uchar
aal5-fmt-list = aal1-fmt-list
rtp-fmt-list = aal1-fmt-list
aal2-fmt-list = (profile *(space profile)) / "-"
profile = decimal-uchar
attribute-fields = *("a=" attribute EOL)
attribute = known-attribute / (generic-att-field ":" att-value) /
generic-att-field
generic-att-field = 1*(alpha-numeric)
att-value = byte-string
known-attribute = atm-attribute / PINT-attribute / rfc2327-attribute
; PINT-attribute as defined in rfc2848
; rfc2327 attribute as defined in that rfc
atm-attribute =
"eecid" ":" eecid /
"aalType" ":" aalType /
"capability" ":" (asc / atc) space subtype /
"qosclass" ":" qosclass /
"bcob" ":" bcob space eetim /
"stc" ":" stc /
"upcc" ":" upcc /
"atmQOSparms" ":" directionFlag space cdvType
space acdv space ccdv space eetd space cmtd
space aclr /
"atmTrfcDesc" ":" directionFlag space clpLvl
space pcr space scr space mbs space cdvt space
mcr space mfs space fd space te /
"abrParms" ":" directionFlag space nrm space trm space cdf
space adtf /
"abrSetup" ":" ficr space bicr space ftbe space btbe space
crmrtt space frif space brif space frdf space brdf /
"bearertype" ":" bearerType space localInitiation /
"lij" ":" sci space lsn /
"anycast" ":" atmGroupAddress space cdStd space
conScpTyp space conScpSel /
"cache" ":" cacheEnable space cacheTimer /
"bearerSigIE" ":" bearerSigIEType space
bearerSigIELng space bearerSigIEVal /
"aalApp" ":" appClass space oui space appId /
"cbrRate" ":" cbrRate /
"sbc" ":" sbc /
"clkrec" ":" clkrec /
"fec" ":" fecEnable /
"prtfl" ":" partialFill /
"structure" ":" structureEnable space blksz /
"cpsSDUsize" ":" directionFlag space cpcs /
"aal2CPS" ":" cidLowerLimit space cidUpperLimit space
timerCU space simplifiedCPS /
"aal2CPSSDUrate" ":" fSDUrate space bSDUrate /
"aal2sscs3661unassured" ":" ted space rastimer space fsssar
space bsssar /
"aal2sscs3661assured" ":" rastimer space fsssar space bsssar
space fsscopsdu space bsscopsdu space fsscopuu
space bsscopuu /
"aal2sscs3662" ":" sap space circuitMode space frameMode
space faxDemod space cas space dtmf space mfall space mfr1
space mfr2 space PCMencoding space fmaxFrame
space bmaxFrame /
"aal5sscop" ":" fsscopsdu space bsscopsdu space fsscopuu
space bsscopuu /
"atmmap" ":" payload-type space encoding-name /
"silenceSupp" ":" silenceSuppEnable space silenceTimer
space suppPref space sidUse space fxnslevel /
"ecan" ":" directionFlag space ecanEnable space ecanType /
"gc" ":" directionFlag space gcEnable space gcLvl /
"profileDesc" ":" aal2-transport space profile space
1*(profile-row) /
"vsel" ":" 1*(encoding-name space packet-length space
packet-time space) /
"dsel" ":" fxIncl space
1*(encoding-name space packet-length space
packet-time space) /
"fsel" ":" 1*(encoding-name space packet-length space
packet-time space) /
"onewaySel" ":" serviceType space directionFlag space
1*(encoding-name space packet-length space
packet-time space) /
"codecconfig" ":" q7655scc /
"isup_usi" ":" isupUsi /
"uiLayer1_Prot" ":" uiLayer1Prot /
"chain" ":" chainPointer
eecid = 8 (HEXDIG)
aalType = "AAL1" / "AAL2" / "AAL3/4" / "AAL5" / "USER_DEFINED_AAL"
asc = "CBR" / "nrt-VBR" / "rt-VBR" / "UBR" / "ABR" / "GFR"
atc = "DBR" / "SBR" / "ABT/IT" / "ABT/DT" / "ABR"
subtype = decimal-U8-or-null
qosclass = decimal-U8-or-null
bcob = generic-U8
eetim = on-off-or-null
stc = decimal-uchar
upcc = decimal-uchar
directionFlag = "f" / "b" / "fb"
cdvType = "PP" / "2P" / "-"
acdv = decimal-U32-or-null
ccdv = decimal-U32-or-null
eetd = decimal-U16-or-null
cmtd = decimal-U16-or-null
aclr = decimal-U8-or-null
clpLvl = "0" / "0+1" / "-"
pcr = decimal-U24-or-null
scr = decimal-U24-or-null
mbs = decimal-U16-or-null
cdvt = decimal-U24-or-null
mcr = decimal-U24-or-null
mfs = decimal-U16-or-null
fd = on-off-or-null
te = on-off-or-null
nrm = generic-U8-or-null
trm = generic-U8-or-null
cdf = generic-U8-or-null
adtf = generic-U16-or-null
ficr = decimal-U24-or-null
bicr = decimal-U24-or-null
ftbe = decimal-U24-or-null
btbe = decimal-U24-or-null
crmrtt = decimal-U24-or-null
frif = 1*2 (DIGIT)
brif = 1*2 (DIGIT)
frdf = 1*2 (DIGIT)
brdf = 1*2 (DIGIT)
bearerType = "PVC" / "SVC" / "CID"
localInitiation = on-off-or-null
sci = generic-U8-or-null
lsn = generic-U32-or-null
atmGroupAddress = atm-type-addr
cdStd = generic-U8-or-null
conScpTyp = generic-U8-or-null
conScpSel = generic-U8-or-null
cacheEnable = on-off-or-null
cacheTimer = generic-U32-or-null
bearerSigIEType = 2 * (HEXDIG)
bearerSigIELng = 1*4 (HEXDIG)
bearerSigIEVal = 2*512 (HEXDIG)
appClass = "-" /
"itu_h323c" / "af83" / "AAL5_SSCOP" / "itu_i3661_unassured" /
"itu_ i3661_assured"/ "itu_i3662"/ "itu_i3651" /
"itu_i3652" / "itu_i3653" / "itu_i3654" / "FRF11" / "FRF5" /
"FRF8" / "itu_h2221"
oui = "-" / 1*6 (HEXDIG)
appId = "-" / 1*8 (HEXDIG)
cbrRate = 2 (HEXDIG)
sbc = generic-U8
clkrec = "NULL" / "SRTS" / "ADAPTIVE"
fecEnable = "NULL" / "LOSS_SENSITIVE" / "DELAY_SENSITIVE"
partialFill = generic-U8
structureEnable = on-off-or-null
blksz = generic-U16-or-null
cpcs = generic-U16
cidLowerLimit = generic-U8-or-null
cidUpperLimit = generic-U8-or-null
timerCU = decimal-U32-or-null
simplifiedCPS = on-off-or-null
fSDUrate = decimal-U24-or-null
bSDUrate = decimal-U24-or-null
ted = on-off-or-null
rastimer = decimal-U32-or-null
fsssar = generic-U24-or-null
bsssar = generic-U24-or-null
fsscopsdu = generic-U16-or-null
bsscopsdu = generic-U16-or-null
fsscopuu = generic-U16-or-null
bsscopuu = generic-U16-or-null
sap = "AUDIO" / "MULTIRATE" / "-"
circuitMode = on-off-or-null
frameMode = on-off-or-null
faxDemod = on-off-or-null
cas = on-off-or-null
dtmf = on-off-or-null
mfall = on-off-or-null
mfr1 = on-off-or-null
mfr2 = on-off-or-null
PCMencoding = "PCMA" / "PCMU" / "-"
fmaxframe = generic-U16-or-null
bmaxframe = generic-U16-or-null
silenceSuppEnable = on-off-or-null
silenceTimer = generic-U16-or-null
suppPref = "standard" / "custom" / "-"
sidUse = "No SID" / "Fixed Noise" / "Sampled Noise" / "-"
fxnslevel = generic-U8-or-null
ecanEnable = on-off-or-null
ecanType = "G165" / "G168" / "-"
gcEnable = on-off-or-null
gcLvl = generic-U16-or-null
profile-row = uuiCodeRange space encoding-name space packet-length
space packet-time space
uuiCodeRange = decimal-uchar "-" decimal-uchar / "-"
encoding-name = "-" /
"PCMG" / "SIDG" / "SID729" /
"PCMU" / "G726-32" / "G723" / "PCMA" / "G722" / "G728" /
"G729" / "X-G729a" / "X-G729b" / "X-G729ab" /
"X-G726-16" / "X-G726-24" / "X-G726-40" / "X-G7231-H" /
"X-G7231-L" / "X-G7231a-H" / "X-G7231a-L" /
"X-G727-16" / "X-G727-24" / "X-G727-32" /
"X-CCD" / "X-CCD-CAS" / "GSM" / "GSM-HR" / "GSM-EFR" /
"GSM-EHR" / "X-FXDMOD-3" / "1016" / "DVI4" / "L16" /
"LPC" / "MPA" / "QCELP" / "H263" / "H263-1998" /
"JPEG" / "H261" / "MPV" / "MP2T" / "nv" / "RED" /
"CelB" / "L8" / "VDVI" / "MP1S" / "MP2P" / "BT656" /
"FR-AMR" / "HR-AMR" / "UMTS-AMR" / "AMR"
packet-length = decimal-U8-or-null
packet-time = decimal-U16-or-null
fxIncl = on-off-or-null
serviceType = "v" / "d" / "f" / "df" / "all"
q7655scc = 4*32 (HEXDIG)
isupUsi = 4*24 (HEXDIG)
uiLayer1Prot = 2 (HEXDIG)
chainPointer = "NEXT" / "PREVIOUS" / "NULL"
References
[1] Handley, M. and V. Jacobson, "SDP: Session Description
Protocol", RFC 2327, April 1998.
[2] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson,
"RTP: A Transport Protocol for Real-Time Applications", RFC
1889, January 1996.
RFC 1889 will be obsoleted, in a substantially backwards
compatible manner, by a work in progress that will become an
RFC.
[3] Schulzrinne, H., "RTP Profile for Audio and Video Conferences with Minimal Control", RFC 1890, January 1996. RFC 1890 will be obsoleted, in a fully backwards compatible manner, by a work in progress that will become an RFC. [4] ATMF UNI 3.1 Specification, af-uni-0010.002. Of special interest for this document is Section 5.4.5.5, ATM Adaptation Layer Parameters. [5] ATMF UNI 4.0 Signaling Specification, af-sig-0061.000. [6] ATMF Traffic Management Specification, Version 4.1, af-tm- 0121.000. [7] ATMF Circuit Emulation Service (CES) Interoperability Specification, version 2.0, af-vtoa-0078.000, Jan. 97. [8] ATMF Voice and Telephony over ATM - ATM Trunking using AAL1 for Narrowband Services, version 1.0, af-vtoa-0089.000, July 1997. [9] ATMF Specifications of (DBCES) Dynamic Bandwidth Utilization - in 64kbps Timeslot Trunking over ATM - using CES, af-vtoa- 0085.000, July 1997. [10] ITU-T I.363.1, B-ISDN ATM Adaptation Layer Specification: Type 1 AAL, August 1996. [11] ITU-T I.363.2, B-ISDN ATM Adaptation Layer Specification: Type 2 AAL, Sept. 1997. [12] ITU-T I.366.1, Segmentation and Reassembly Service Specific Convergence Sublayer for AAL Type 2, June 1998. [13] ITU-T I.366.2, AAL Type 2 Reassembly Service Specific Convergence Sublayer for Trunking, Feb. 99. [14] Petrack, S., "RTP payloads for Telephone Signal Events", Work in Progress. [15] ITU-T Q.2931, B-ISDN Application Protocol for Access Signaling. [16] Amendment 1, 2, 3 and 4 to ITU-T Q.2931, B-ISDN Application Protocol for Access Signaling. [17] Handley, M., Perkins C. and E. Whelan, "Session Announcement Protocol", RFC 2974, October 2000.
[18] Handley, M., Schulzrinne, H., Schooler, E. and J. Rosenberg, "Session Initiation Protocol (SIP)", RFC 2543, March 1999. [19] Almquist, P., "Type of Service in the Internet Protocol Suite", July 1992. [20] Nichols, K., Blake, S., Baker, F. and D. Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", December 1998. [21] ITU-T I.363.5, B-ISDN ATM Adaptation Layer Specification: Type 5 AAL, Aug. 1996. [22] ATMF PNNI 1.0, af-pnni-0055.000, March 1996. [23] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson, "RTP: A Transport Protocol for Real-Time Applications", Work in Progress. [24] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and Video Conferences with Minimal Control", Work in Progress. [25] Arango, M., Dugan, A., Elliott, I., Huitema, C. and S. Pickett, "Media Gateway Control Protocol (MGCP)", RFC 2705, October 1999. [26] Cuervo, F., Greene, N., Rayhan, A., Huitema, C., Rosen, B. and J. Segers, "Megaco Protocol Version 1.0", RFC 3015, November 2000. [27] Atkinson, R., "IP Authentication Header", RFC 1826, August 1995. [28] ITU I.371, Traffic Control and Congestion Control in the BISDN. [29] ITU E.191, BISDN Numbering and Addressing. [30] ATM Forum Addressing: Reference Guide, af-ra-0106.000. [31] http://www.iana.org/assignments/rtp-parameters for a list of codecs with static payload types. [32] ITU Q.2941-2, Digital Subscriber Signalling System No. 2 (DSS 2): Generic identifier transport extensions. [33] ITU Q.2961, Digital subscriber signalling system no.2 (DSS 2) - additional traffic parameters. Also, Amendment 2 to Q.2961. [34] ITU Q. 2965.1, Digital subscriber signalling system no.2 (DSS 2) - Support of Quality of Service classes.
[35] ITU Q. 2965.2, Digital subscriber signalling system no.2 (DSS 2) - Signalling of individual Quality of Service parameters. [36] ITU Q.1901, Bearer Independent Call Control Protocol. [37] ITU Q.2630.1, AAL type 2 signaling protocol - capability set 1. [38] ITU I.363.5, B-ISDN ATM Adaptation Layer specification: Type 5 AAL. [39] I.365.1,Frame relaying service specific convergence sublayer (FR-SSCS). [40] I.365.2, B-ISDN ATM adaptation layer sublayers: service specific coordination function to provide the connection oriented network service. [41] I.365.3, B-ISDN ATM adaptation layer sublayers: service specific coordination function to provide the connection-oriented transport service. [42] I.365.4, B-ISDN ATM adaptation layer sublayers: Service specific convergence sublayer for HDLC applications. [43] Q.2110, B-ISDN ATM adaptation layer - service specific connection oriented protocol (SSCOP). [44] af-vtoa-0113.000, ATM trunking using AAL2 for narrowband services. [45] H.323-2, Packet-based multimedia communications systems. [46] af-vtoa-0083.000, Voice and Telephony Over ATM to the Desktop. [47] I.356, BISDN ATM layer cell transfer performance. [48] ITU Q.2957, Digital Subscriber Signaling System No. 2, User to user signaling. [49] Mills, D., "Network Time Protocol (Version 3) Specification, Implementation and Analysis", RFC 1305, March 1992. [50] TIA/EIA/IS-J-STD-025-A, Lawfully Authorized Electronic Surveillance, May 2000. [51] ITU-T H.222.1, Multimedia multiplex and synchronization for audiovisual communication in ATM environments.
[52] af-vmoa-0145.000, Voice and Multimedia over ATM, Loop Emulation Service using AAL2. [53] FRF.5, Frame Relay/ATM PVC Network Interworking Implementation Agreement. [54] FRF.8.1, Frame Relay/ATM PVC Service Interworking Implementation Agreement. [55] FRF.11, Voice over Frame Relay Implementation Agreement. [56] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 2234, November 1997. [57] ITU Q.765.5, Application Transport Mechanism - Bearer Independent Call Control. [58] http://www.3gpp.org/ftp/Specs for specifications related to 3GPP, including AMR codecs. [59] ITU Q.931, Digital Subscriber Signaling System No. 1: Network Layer. [60] ITU Q.763, SS7 - ISUP formats and codes. [61] http://www.atmforum.com/atmforum/specs/specs.html, ATM Forum, Well-known addresses and assigned codes. [62] Bradner, S., "Keywords for use in RFCs to indicate requirement levels", BCP 14, RFC 2119, March 1997.
Acknowledgements
The authors wish to thank several colleagues at Cisco and in the industry who have contributed towards the development of these SDP conventions, and who have reviewed, implemented and tested these constructs. Valuable technical ideas that have been incorporated into this internet document have been provided by Hisham Abdelhamid, Flemming Andreasen, David Auerbach, Robert Biskner, Bruce Buffam, Steve Casner, Alex Clemm, Bill Foster, Snehal Karia, Raghu Thirumalai Rajan, Joe Stone, Bruce Thompson, Dan Wing and Ken Young of Cisco, Michael Brown, Rade Gvozdanovic, Graeme Gibbs, Tom-PT Taylor, Mark Watson and Sophia Scoggins of Nortel Networks, Brian Rosen, Tim Dwight and Michael Mackey of Marconi, Ed Guy and Petros Mouchtaris of Telcordia, Christian Groves of Ericsson, Charles Eckel of Vovida Networks, Tom Jepsen, Dal Chohan, Sagar Gordhan and Chris Gallon of Fujitsu, Mahamood Hussain of Hughes Software Systems and Sean Sheedy of nCUBE Corporation, Narendra Tulpule of Intel, Albrecht Schwarz of Alcatel, and Jonathan Rosenberg of Dynamicsoft. The authors also wish to thank the ISC device control group, and the MMUSIC and MEGACO subgroups of the IETF, especially Bill Foster, Joerg Ott, Sean Sheedy and Brian Rosen for their help in the preparation of this document. Finally, thanks are due to Narendra Tulpule of Intel whose ABNF grammar was adapted for this document.Authors' Addresses
Rajesh Kumar Cisco Systems, Inc. M/S SJC01/3 170 West Tasman Drive San Jose, CA 95134-1706 Phone: 1-800-250-4800 EMail: rkumar@cisco.com Mohamed Mostafa Cisco Systems, Inc. M/S SJC01/3 170 West Tasman Drive San Jose, CA 95134-1706 Phone: 1-800-250-4800 EMail: mmostafa@cisco.com
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