7 User plane Interworking

29.1643GPPInterworking between the 3GPP CS domain with BICC or ISUP as signalling protocol and external SIP-I networksRelease 17TS

7.1 ISUP based CS Domain

Figure 7.1.1 shows the user plane protocol stacks within the SIP-I network and an ISUP based CS Domain.

Apart from speech codecs, data call related codecs, e.g. as listed in Table 2a of 3GPP TS 29.163 [4], may be used.

Figure 7.1.1: User Plane Interworking and ISUP based CS Domain

7.2 BICC based CS Domain

Figure 7.2.1 shows the user plane protocol stacks within the SIP-I network and an BICC based CS Domain.

Apart from speech codecs, data call related codecs, e.g. as listed in Table 2a of 3GPP TS 29.163 [4], may be used.

Within the CS domain, the Nb interface as specified in 3GPP TS 29.414 [7] and 3GPP TS 29.415 [8] is used.

If the same codec is used on both sides, no transcoding is required. If no transcoding is performed, the procedures in Clause 8.1.1 of 3GPP TS 29.163 [4] shall be applied to interwork the Nb framing Protocol, as specified in 3GPP TS 29.415 [8], with RTP, as specified in IETF RFC 3550 [36].

Figure 7.2.1: User Plane Interworking for BICC based CS Domain