Reliable RTT (real-time text)

This document describes a private Session Initiation Protocol (SIP) [IETF RFC 3261] header (P-header), used to achieve real-time sending of text using SIP Message requests, along with its applicability. The formatting of the real-time text (RTT) messages follows ITU-T Recommendation T.140.

This Technical Specification for RTT exchange between ICT systems (including networks, devices, services and protocols) is made available by the Swedish Post and Telecom Authority (PTS). It is made freely available and without any claims on Intellectual Property Rights (IPRs) providing a common specification for RTT exchange. Its most recent, published version always supersedes all previous versions. The copyright for this specification belongs to the Swedish Post and Telecom Authority (PTS). This specification is free to use and to publish.