Appendix A. SIP Methods and Responses


Appendix A. SIP Methods and Responses

Table A-1 shows SIP methods.

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 contact 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 shows SIP responses.

Table A-2. Responses

100

 

Trying

180

 

Ringing

181

 

Call Is Being Forwarded

182

 

Queued

183

 

Session Progress

200

 

OK

202

 

Accepted

300

 

Multiple Choices

301

 

Moved Permanently

302

 

Moved Temporarily

305

 

Use Proxy

380

 

Alternative Service

400

 

Bad Request

401

 

Unauthorized to Use This Registrar

402

 

Payment Required

403

 

Forbidden

404

 

User Not Found

405

 

Method Not Allowed

406

 

Not Acceptable

407

 

Proxy Authentication Required

408

 

Request Timeout

410

 

This User Is Gone From Here

413

 

Request Entity Too Large

414

 

Request URI Too Long

415

 

Unsupported Media Type

416

 

Unsupported URI Scheme

420

 

Bad Protocol Extension

421

 

Extension Required

423

 

Interval Too Brief

480

 

Temporarily Unavailable

481

 

Call/Transaction Does Not Exist

482

 

Loop Detected

483

 

Too Many Hops

484

 

Address Incomplete

485

 

Ambiguous

486

 

Busy Here

487

 

Request Terminated

488

 

Not Acceptable Here

491

 

Request Pending

493

 

Undecipherable s/MIME Part

500

 

Server Internal Error

501

 

Method Not Implemented on This Server

502

 

Bad Gateway

503

 

Service Unavailable

504

 

Server Timeout

505

 

Version Not Supported

513

 

Message Too Large

600

 

Busy Everywhere

603

 

Decline

604

 

Does Not Exist Anywhere

606

 

Not Acceptable




Switching to VoIP
Switching to VoIP
ISBN: 0596008686
EAN: 2147483647
Year: 2005
Pages: 172

Similar book on Amazon

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net