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draft-manyfolks-sipping-ToIP-01.txt
Real-Time Text Conversation Using SIP
Any Interactive text call using the text gateway must work like a direct IP-IP call.

Access to services
Call handling, REFER, forwarding, call wait etc
Emergency calls using interactive text
same framework as from a SIP phone (emergency center)
works same for PSTN originated call
and also for a Mobile originated call

PPT Version