SIP Presence

SIP Presence†

SIP Presence: A asks to be told when B registers
SIP Presence: A asks to be told when B registers

† From the lecture notes “SIP Tutorial: Introduction to SIP” by Henry Sinnreich and Alan Johnston, formerly at http://smuhandouts.com/8393/SIPTutorial.pdf

Transcript

[slide143] We can now use SIP SIMPLE, and we can send a request to say, tell me when B is available. So we go and subscribe to B's availability. We exchange all these messages.