C.5 SDP Example

29.0073GPPGeneral requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)Release 17TS

The following example shows an SDP offer during the setup of a SCUDIF call, where Multimedia is the preferred encoding and the network initiated service change is supported. AMR and PCM are offered as speech codecs for a fallback.

m=audio 12345 RTP/AVP 97 98 99 0

a=rtpmap:97 vnd.3gpp.clearmode/8000

a=rtpmap:98 vnd.3gpp.clearmode/8000

a=fmtp:98 network-initiated-service-change

a=rtpmap:99 AMR/8000/1

a=3gOoBTC

Annex D (informative):
IANA registration information for RTP payload types for SCUDIF in SIP-I based CS core network