This chapter describes the abilities and disabilities of SIP.
The scope of SIP is confined to the setup, modification and termination of sessions. Its purposes can be summarized as follows:
It allows for the establishment of a user location.
It provides a method to allow feature negotiation so that all of the participants in a session can agree on the features to be supported among them.
It can effectively exercise call management - for example adding, terminating, or transferring participants.
It allows for changing features of a session while it is in progress.
Other functions are done with other protocols.
does not describe sessions. This is handled by the Session Description Protocol.Parent topic: SIP Overview
does not control conferences.
does not act as a resource reservation protocol.
does not provide QOS (Quality of Service).
can work other protocols to ensure these functions are carried out.
can and does function with SOAP (Simple Object Access Protocol), HTTP, XML, VXML, WSDL (Web Services Description Language), UDDI (Universal Description, Discovery and Integration), SDP (Session Description Protocol) and others.