SIP Call Setup Attempt

SIP Call Setup Attempt†

SIP Call Setup Attempt - when B has not registered
SIP Call Setup Attempt - when B has not registered

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

Transcript

[slide141] We get a set of messages coming back, and eventually we see temporarily unavailable, we acknowledge it, and finally we say, okay, we couldn't reach B.