What is SIP?
SIP performs many important functions such as:
- Establishment of user location
Allowing for the establishment of user location (translating a user name to their current network address).
- Providing negotiation of features
so that all in a session can agree on the features to be supported.
- Acting as a call management mechanism
including adding, dropping, or transferring participants
- Changing features of a session
while it is in progress.
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