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Session Description  Addressing  generic rules  "a=" SDP Attributes
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SDP attributes defined in

3GPP TS 26.114 – IMS - Multimedia telephony

3GPP TS 26.114 – Annex M
a=3gpp_sync_info   a=3gpp_MaxRecvSDUSize   a=3gpp_mtsi_app_adapt   a=predefined_ROI   a=bw‑info

 

attribute  =/
Synchronization‑Info /  Max‑receive‑SDU‑size‑def /  adaptation‑attribute /  predefined_ROI /  bw-attrib
Synchronization-Info =
"a"  "="  "3gpp_sync_info"  ":"  sync-value
;  see  Clause 6.2.6  of 3GPP TS 26.114
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sync-value =
"Sync" /  "No Sync"
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Max-receive-SDU-size-def =
"a"  "="  "3gpp_MaxRecvSDUSize"  ":"  size-value
;  see  Clause 12.2.4.6.1  of 3GPP TS 26.114
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size-value =
1*5DIGIT
; 0 to 65535 in octets
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adaptation-attribute =
"a"  "="  "3gpp_mtsi_app_adapt"  ":"  reqName  *( ","  reqName )
;  see  Clause 10-2-3  of 3GPP TS 26.114
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reqName =
"RedReq" /  "FrameAggReq" /  "AmrCmr" /  "EvsRateReq" /  "EvsBandwidthReq" /  "EvsParRedReq" /  "EvsIoModeReq" /  "EvsPrimaryModeReq"
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predefined_ROI =
"a"  "="  "predefined_ROI"  ":"  PT  WSP  attr-list
;  see  Clause 6-2-3-4  of 3GPP TS 26.114
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PT =
1*DIGIT /  "*"
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attr-list =
( set  *( 1*WSP  set ) ) /  "*"
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set =
"["  "ROI_ID="  idvalue  ","  "Position_X="  posvalue  ","  "Position_Y="  posvalue  ","  "Size_X="  sizevalue  ","  "Size_Y="  sizevalue  ","  "Name="  namevalue  "]"
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idvalue =
onetonine  *2DIGIT
; Digit between 1 and 9 that is followed by 0 to 2 other digits
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posvalue =
sizevalue /  "0"
; position may be "0"
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sizevalue =
onetonine  *5DIGIT
; Digit between 1 and 9 that is followed by 0 to 5 other digits
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onetonine =
"1" /  "2" /  "3" /  "4" /  "5" /  "6" /  "7" /  "8" /  "9"
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namevalue =
byte‑string
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bw-attrib =
"a=bw‑info:"  pt‑def  SP  direction  SP  bw‑def  *( ";"  [SP]  bw‑def )
;  see  Clause 19-3  of 3GPP TS 26.114
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pt-def =
"*" /  pt-val  *( ","  pt-val )
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pt-val =
1*3DIGIT
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direction =
"send" /  "recv" /  "sendrecv" /  direction-ext
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direction-ext =
1*VCHAR
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bw-def =
bw-name  "="  bw-val-def
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bw-name =
1*VCHAR
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bw-val-def =
zero-based-int-or-real /  bw-val-def-ext
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bw-val-def-ext =
zero-based-int-or-real  *( ":"  zero-based-int-or-real )
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zero-based-int-or-real =
zero-based-integer /  non-zero-real
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zero-based-integer =
"0" /  integer
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non-zero-real =
zero-based-integer  ."  *DIGIT  POS‑DIGIT
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