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5E   Presentation and control [R12]
5F   Local system support functions [R12]
6   Registration and authentication [R12]
6A   Deregistration [R12]   PDF-p. 21
7   Call origination and termination [R12]
8   Data channel open and close [R12]   PDF-p. 30
9   Call modification [R12]
10   IP multimedia application support in the IM CN subsystem using webRTC [R12]   PDF-p. 34
A   Example signalling flows [R12]   PDF-p. 35
B   Change history   PDF-p. 38

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