From which layer of sip stack (transport layer, transaction layer or transaction user), sip messages get generated?
For example, at which layer INVITE, ACK, CANCEL etc. get generates? Is it transaction user or transaction layer?
Hi,
Basically , Transaction users (TU) will Generate the INVITE, ACK..etc methods and send the same to the client transaction --> Client transport.. when proxy/server receives the request first it comes to Server transport --> server transaction and then proxy Core.
-Bhushan
In one of the articles it was mentioned "BYE" SIP message routes end to end and by pass the SIP proxy server. What is it mean ? and when SIP proxy servers release the resources that was reserved during the session establishment ?
