Appendix; Sip Call Flows - Cisco 7960 Administrator's Manual

SIP Call Flows

SIP uses six request methods:
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The following types of responses are used by SIP and generated by the Cisco SIP
gateway:
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INVITE—Indicates a user or service is being invited to participate in a call
session.
ACK—Confirms that the client has received a final response to an INVITE
request.
BYE—Terminates a call and can be sent by either the caller or the callee.
CANCEL—Cancels any pending searches but does not terminate a call that
has already been accepted.
OPTIONS—Queries the capabilities of servers.
REGISTER—Registers the address listed in the To header field with a SIP
server.
SIP 1xx—Informational Responses
SIP 2xx—Successful Responses
SIP 3xx—Redirection Responses
SIP 4xx—Client Failure Responses
SIP 5xx—Server Failure Responses
SIP 6xx—Global Failure Responses
A P P E N D I X
Cisco SIP IP Phone 7960 Administrator Guide
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