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Changes since last draft Clarified scope Define a framework for the implementation of ToIP, stand-alone or as part of a total conversation Description of ToIP using SIP and RTP; Requirements of Real-time, interactive text; Requirements for ToIP interworking with gateways (e.g. PSTN) Stressed that ToIP is similar to VoIP for SIP Call flows moved to planned separate draft Clarified requirements removed most overlaps access to emergency services similar to VoIP |