[SR-Users] Sending CANCEL

[Grant Bagdasarian]

Ohh, that's gonna be tricky then. 

Well, the thing is we want to do some kind of answer machine detection by catching the 181 SIP responses and CANCEL the dialogs. I've tested this with one of our suppliers and for the most mobile operators in this country a 181 response is given when the call is being forwarded to voicemail. For our purpose this covers roughly about 90% of all the calls. I know there are modules available for Asterisk and FreeSwitch which do AMD, but those consume too much resources.

-----Original Message-----
From: sr-users-bounces at lists.sip-router.org [mailto:sr-users-bounces at lists.sip-router.org] On Behalf Of Alex Balashov
Sent: Thursday, July 4, 2013 9:33 AM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Sending CANCEL

Kamailio is a proxy, and not designed to originate requests.

If you really, really want to generate a request, you can use
uac_req_send():

    http://kamailio.org/docs/modules/4.0.x/modules/uac.html#idp1686632

But, you'll have to spoof all the parameters, including the pertinent branch ID, From tag and CSeq, correctly.  I'm not sure if $uac_req(...) lets you do that.

This is a very bad idea.  CANCELs -- like most requests -- are for user agents to send, not proxies.

-- Alex

On 07/04/2013 03:30 AM, Grant Bagdasarian wrote:

> Hello,
>
> Which module can I use to have Kamailio generate a CANCEL request when 
> it receives a certain reply code? I want to cancel a dialog when 
> Kamailio receives a 181 Call Forwarded.
>
>
>
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> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing 
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--
Alex Balashov - Principal
Evariste Systems LLC
235 E Ponce de Leon Ave
Suite 106
Decatur, GA 30030
United States
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/

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