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ETSI TS 126 114
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ETSI TS 126 114 Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction (3GPP TS 26.114 version 14.3.0 Release 14)
standard by European Telecommunications Standards Institute, 04/01/2017
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Full Description
ETSI TS 126 114 specifies a client for the Multimedia Telephony Service for IMS (MTSI) supportingconversational speech (including DTMF), video and text transported over RTP with the scope to deliver a userexperience equivalent to or better than that of Circuit Switched (CS) conversational services using the same amount ofnetwork resources. It defines media handling (e.g. signalling, transport, jitter buffer management, packet-loss handling,adaptation), as well as interactivity (e.g. adding or dropping media during a call). The focus is to ensure a reliable andinteroperable service with a predictable media quality, while allowing for flexibility in the service offerings.The present document describes two client types: An MTSI client in terminal which uses a 3GPP access (LTE, HSPA, or EGPRS) to connect to the IMS. Theseclients are described in Clauses 5 - 17 and Annexes A - M. An MTSI client in terminal which uses a fixed access (corded interface, fixed-wireless interface, e.g. Wi-Fi,Bluetooth or DECT/NG DECT) to connect to the IMS. These clients are described in Clause 18.MTSI clients using 3GPP access and MTSI clients using fixed access have many common procedures for the mediahandling. This specification aligns the media handling by using cross references whenever possible. This does not meanthat 3GPP terminals must support fixed access, nor does it mean that fixed terminals must support 3GPP access.
The scope includes maintaining backward compatibility in order to ensure seamless inter-working with existing servicesavailable in the CS domain, such as CS speech and video telephony, as well as with terminals of earlier 3GPP releases.In addition, inter-working with other IMS and non-IMS IP networks as well as traditional PSTN is covered.
The client may also support the IMS Messaging service and Group 3 facsimile transmission. The scope therefore alsoincludes media handling for non-conversational media using MSRP and UDPTL-based Facsimile over IP (FoIP).
The specification is written in a forward-compatible way in order to allow additions of media components andfunctionality in releases after Release 7.