The SIP protocol defines some common request types:
Table 1–1 Common SIP Requests
SIP Request |
Description |
---|---|
INVITE |
initiate a session between two participants |
ACK |
the client acknowledges receiving the final message from an INVITE request |
BYE |
terminates a connection |
CANCEL |
cancels any pending actions, but does not terminate any accepted connections |
OPTIONS |
queries the server for a list of capabilities |
REGISTER |
registers the address in the To header with the server |
SIP requests are codes used to indicate the various stages in a connection between SIP-enabled entities.
See SIP Requests for a list of all SIP requests.