SIP Requests

 

 

SIP Requests
(From CME) Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, REGISTER

INVITE
Initiates conversation
OPTIONS Determines SIP Messages and Codecs that the UA or server understands
BYE Terminates Existing connection
CANCEL Cancels an Pending INVITE
ACK Acknowledges a pending invite from a INVITE request
PRACK same role as ACK, but for provisional responses
UPDATE allows a client to update parameters of a session
REFER Transfers calls and contacts to external resources
SUBSCRIBE Indicates desire for future NOTIFY Messages
NOTIFY Provides info about a state change that is not related to a specific session
REGISTER Registers a location from a SIP Server

Useful Links:
SIP RFCs and Drafts

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