SIP Request Methods Response Codes.
SIP Request Methods
There are several different Request methods to server different purposes. SIP borrowed headers and body format from the protocol HTTP. Like HTTP SIP also has different methods. following table will describe those request methods
| S.No | Method | Description |
|---|---|---|
| 1 | REGISTER | Registers to receive inbound calls on registrar or SIP server |
| 2 | INVITE | Established a new session |
| 3 | ACK | Confirms that message/request has been received |
| 4 | BYE | Ends Session |
| 5 | CANCEL | Cancels establishing session |
| 6 | OPTIONS | Queries capabilities of server |
| 7 | PARK | Provisional Acknowledgement |
| 8 | SUBSCRIBE | Subsribes for an Notifications from the Notifier |
| 9 | NOTIFY | Notify the subscriber a new Event |
| 10 | PUBLISH | Publish and event to the Server |
| 11 | INFO | Sends mid-session information |
| 12 | REFERER | Asks the recipient to issue call transfer |
| 13 | MESSAGE | Transport Insant Message |
| 14 | UPDATE | Modifies the state of a session without changing the state of the dialog. |
….
SIP Responses
Like I mentioned earlier, SIP protocol borrowed few things from protocol HTTP. SIP borrowed response code from HTTP. Most of response codes are similar to HTTP and SIP extends them codes to 6xx.
| S.No | Code | Description |
|---|---|---|
| 1 | 1xx | Informational responses |
| 2 | 2xx | Success Responses |
| 3 | 3xx | Redirect Responses |
| 4 | 4xx | Request Failure/Client Error |
| 5 | 5xx | Server Error |
| 6 | 6xx | Global Failures |
Hi,
Do you know we can don´t activate in asterisk SIP REQUEST METHODS.
We need to desactivate Subscribe, Refer, Notify, Info, Publish, Message.
And add:
Update, Prack.
At your comments