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Content for  TS 23.146  Word version:  17.0.0

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A (Normative)  Structure and contents of the FA protocol elementsWord‑p. 26

A.1  Internet Fax ProtocolWord‑p. 26

This ANNEX is related to the application of the T.38 protocol within the present document.
Only the following packets are used:
  • T30_INDICATOR
    • CNG
    • CED
    • TCF error detection (not in T.38)
    • FA_busy_packet (not in T.38)
    • FA_non_busy_packet (not in T.38)
  • T30_DATA
    • V.21 channel 2 (except MCF, CFR, RTN, RTP, PIP, PIN, PRI, PPR, NSF, NSC, RR, RNR, ERR)
    • V.27 ter 2400
    • V.27 ter 4800
    • V.29 7200
    • V.29 9600
    • V.17 7200
    • V.17 9600
    • V.17 12000
    • V.17 14400
In T30_ DATA the maximum length of T.4-Non-ECM/HDLC data is equal to 1 400 octets.
Aligned Packet Encoding Rule is applied to ASN.1.
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A.2  Facsimile UDP Transport Layer ProtocolWord‑p. 26

The FEC option and the redundant message option shall not be used.

A.3  User Datagram ProtocolWord‑p. 26

The port number at client side is ephemeral (assigned on a call by call basis). The port number at the server side is manually preassigned by the operator.

A.4  Internet ProtocolWord‑p. 27

The IP address is not required because a circuit switched connection is used between the UE and IWF. However, IP addresses shall be used in order to be consistent with IP.
The IP address at UE side and IWF side are assigned by PPP.

A.5  Point to Point ProtocolWord‑p. 27

For the communication between the two FAs IP is provided on top of PPP.
PPP shall conform to RFC 1662, 1661, 1570 and 1332.

A.6  Mapping of FA framesWord‑p. 27

Refer also to TS 27.002.
Copy of original 3GPP image for 3GPP TS 23.146, Fig. A.1: Typical frame mapping within FA protocol
Figure A.1: Typical frame mapping within FA protocol
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.146, Fig. A.2: Typical frame mapping between FA Protocol and RLP
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