name: MTSI
full_form: Multimedia Telephony Service for IMS
context: [60] shall not be used in the session setup. An MTSI client shall offer AVPF for all media streams containing video. RTP profile negotiation shall be done as described in clause 6.2.1a. An MTSI client is required to support the AVPF feedback messages trr-int, NACK and PLI [40] and the CCM feedback messages FIR, TMMBR and TMMBN [43], see Clauses 7.3.3 and 10.3. These feedback messages can only be used together with AVPF and shall be negotiated in SDP offer/answer before they can be used in the session [40]. An MTSI client sending an SDP offer for AVPF shall also include these AVPF and CCM feedback messages in the offer. An MTSI client accepting an SDP offer for AVPF for video shall also accept these AVPF and CCM feedback messages if they are offered. If an MTSI client offers to use ECN for video in RTP streams then the MTSI client shall offer ECN Capable Transport as defined below. If an MTSI client accepts an offer for ECN for video then the MTSI client shall declare ECN Capable
description: Multimedia Telephony Service for IMS (MTSI) enables multimedia communication, including voice and video calls, over IP networks. It utilizes protocols like SIP, RTP, and SDP to manage sessions and ensure quality of service.
explanation: MTSI is explicitly described as a telecommunications service that facilitates multimedia communication within the IMS network. This functionality aligns with the definition of a telecommunications service.
section_title: 7.17MTSI MT Video call without preconditions at both originating UE and terminating UE / 5GS
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