The SIP specification has been extended over time to support a general mechanism allowing for subscription to asynchronous events. Such events can include SIP proxy
ACK method confirms that an entity has received a final response to an INVITE request. In its turn, BYE method signals termination of a dialog
Calls are started by means of the methods INVITE together with SDP (Session Description Protocol) which carry the information necessary to allow the endpoints of
SIP is a peer-to-peer protocol where the roles client – server and exchangeable depending on who starts a session. In reality most deployments foresee a
This blog article will be dedicated to SIP and SIP calls. It is meant to provide an introduction for UC Engineers to the main headers
