SIP Instant Messaging Example

SIP Instant Messaging Example†

A sends a message to B
A sends a message to B

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

Transcript

[slide158] We redo the SUBSCRIBE, and now, in this case, we instead of reinitiating the call, now B gets a chance to be able to respond.