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ETSI TS 126 103
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ETSI TS 126 103 Universal Mobile Telecommunications System (UMTS); Speech Codec List for GSM and UMTS (3GPP TS 26.103 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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Full Description
ETSI TS 126 103 outlines the Codec Lists in 3GPP including both systems, GSM and UMTS, to beused by the Out of Band Transcoder Control (OoBTC) protocol to set up a call or modify a call in Transcoder FreeOperation (TrFO) and in "transcoder at the edge" scenarios.The TS also specifies the SDP description of 3GPP Codecs to be used within a SIP-I -based circuit switched corenetwork as specifies in 3GPP TS 23.231 [14].
The TS further specifies the coding of the Supported Codec List Information Elements for the UMTS radio accesstechnology.
The TS further reserves the Code Point for the CSData (dummy) Codec Type for the negotiation of A-Interface Typeand the RTP redundancy for CS Data and Fax services, see 3GPP TS 48.008 [23].
The Supported Codec List IE includes Codec_Types from the TDMA and PDC systems, to support TFO or TrFObetween UMTS and TDMA, or UMTS and PDC.