June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Appendix A
APPENDIX A
SIP Methods and Responses
Table A-1 shows SIP methods.
Table A-2 shows SIP responses.
.
Table A-1. Methods
INVITE A SIP device is being invited to participate in a call.
ACK Confirms that the client has received a final response to an INVITE request.
BYE Terminates a SIP call. Can be sent by any party involved.
CANCEL Cancels any pending call but does not terminate a call that has already been connected.
OPTIONS Queries the capabilities of servers without requesting to establish a call.
REGISTER Registers an IP with a SIP registrar.
PRACK Insures reliability of provisional 1xx responses if a UAS offers them.
UPDATE Updates a previously made offer for a not-yet-established session.
REFER Initiates a call transfer by telling the recipient (specified by URI) to contact a third party using the con-
tact information provided in the request.
SUBSCRIBE Subscribes to be notified of an event occurrence; for example a user presence update.
NOTIFY Used to notify that an event has occurred.
MESSAGE A method signifying the payload is an instant message.
Table A-2. Responses
100 Trying
180 Ringing
181 Call Is Being Forwarded
182 Queued
183 Session Progress
200 OK
202 Accepted
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.