33 MTSI Data channel

29.1653GPPInter-IMS Network to Network Interface (NNI)Release 18TS

Based on inter-operator agreement, data channel as described in 3GPP TS 26.114 [11] may be supported at the II-NNI.

If MTSI data channel is supported, the procedures specified in 3GPP TS 26.114 [11] shall be applied and the capabilities below shall be provided at the II-NNI.

The "+sip.app-subtype" media feature tag with a value of "webrtc-datachannel" in the Contact header field parameter of the REGISTER request shall be supported at the roaming II-NNI.

The "+sip.app-subtype" media feature tag with a value of "webrtc-datachannel" in the Contact header field parameter of INVITE and UPDATE requests and in 18x and 2xx responses to INVITE and UPDATE requests shall be supported at the II-NNI.

The "m=" line set to "application <port number> UDP/DTLS/SCTP webrtc-datachannel" and associated parameters in the media line attributes "a=dcmap" and "a=3GPP-qos-hint" of the SDP body shall be supported at the II-NNI. For the "bootstrap" data channel as defined in table 6.2.10.1-2 of 3GPP TS 26.114 [11] only stream ID 100 and stream ID 110 shall be supported at the II-NNI.

NOTE: Stream ID 0 and stream ID 10 "bootstrap" data channels are strictly local between the UE and its local network.