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C-1
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
APPENDIX
C
SIP Call Flows
This appendix describes some basic call flows for the
Cisco IP Phone models 7905G and 7912G. It includes the following sections:
• Supported SIP Request Methods, page C-1
• Call Flow Scenarios for Successful Calls, page C-2
Supported SIP Request Methods
The Cisco IP Phone supports the following SIP request methods:
• 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.
• REGISTER—Registers the address listed in the To header field with a SIP
proxy.
• NOTIFY—Notifies the user of the status of a transfer using REFER. Also
used for remote reset and for message waiting.
• OPTIONS—Provides requestors with SIP methods and codecs supported by
the phone.