Appendix; Sip Call Flows; Call Flow Scenarios For Successful Calls; Gateway-To Cisco Sip Ip Phone-Successful Call Setup And Disconnect - Cisco SIP IP Phone Administrator's Manual

SIP Call Flows

This chapter includes the following sections:
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SIP uses the following 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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Call Flow Scenarios for Successful Calls

This section describes call flows for the following scenarios, which illustrate successful calls:
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Call Flow Scenarios for Successful Calls, page B-1
Call Flow Scenarios for Failed Calls, page B-46
INVITE—Indicates that 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.
REFER—Indicates that the user (recipient) should contact a third party for use in transferring
parties.
NOTIFY—Notifies the user of the status of a transfer using REFER. Also used for remote reset.
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
Gateway-to Cisco SIP IP Phone—Successful Call Setup and Disconnect, page B-2
Gateway-to-Cisco SIP IP Phone—Successful Call Setup and Call Hold, page B-4
Cisco SIP IP Phone-to-Cisco SIP IP Phone Simple Call Hold, page B-6
A P P E N D I X
Cisco SIP IP Phone Administrator Guide
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