K.5 Applicable T.38 SDP attributes at the Mn Interface

29.1633GPPInterworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networksTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

This clause lists T.38 related SDP attributes that can be signalled towards the IM-MGW as part of the codec information within the "Local IMS Resources" and "Remote IMS Resources" parameters within the "Reserve IMS connection point", "Configure IMS resources" and "Reserve IMS Connection point and configure remote resources" procedures described in clause 9.

Table K.5.1: Applicable T.38 SDP attributes at the Mn Interface

Attribute	Remarks
T38FaxVersion	T.38 SDP attributes shall only be provisioned for Version 2 or higher. Version 0 applies if attribute is omitted.
T38MaxBitRate
T38FaxMaxBuffer
T38FaxMaxDatagram
T38FaxMaxIFP	Only if T.38 version 4 is supported by the IM-MGW
T38FaxUdpEC
T38FaxUdpECDepth	Only if T.38 version 4 is supported by the IM-MGW
T38FaxUdpFECMaxSpan	Only if T.38 version 4 is supported by the IM-MGW
T38ModemType	Only if T.38 version 4 is supported by the IM-MGW

Annex L (normative):
Interworking of called IN number and original called IN number parameters