Actually there is nothing special to rely on what so ever prerogatives in this case. Writing cdrs based on dialog module was added by 1&1 long time ago (iirc) and they have couple of millions of subscribers and tons of calls, so this approach might have been better for them from various reasons. In big telcos, cdrs are aggregated from many sources, and a lot of nodes collect CDRs just for statistics or monitoring.

The fact is that the dialog can be discarded on timeout without sending bye, being the default behaviour -- in this case the cdr is produced. When enabling to send bye, the cdr is not produced -- it doesn't seem to be anything more clear that this is a bug.

I rely on transaction accounting (acc alone), finding it more flexible to store various events, even during the call. I guess most of the people do the same in a proxy. On the other hand, dialog module adds a call-stateful proxy layer, which I use extensively for limiting active call as well as terminating on timeout with byes. But like you, I write the stop event for cdrs from tm local request event.

Cheers,
Daniel

On 15/04/15 17:25, Alex Balashov wrote:
Fair enough. It is your prerogative to take a definitive stance on the issue. I was just voicing personal view that truly complete accounting can only be done from SIP message-oriented perspective in software that does not formally have a dialog layer.

--
Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

Sent from my BlackBerry.
From: Daniel-Constantin Mierla
Sent: Wednesday, April 15, 2015 10:59
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] No CDR is written when dialog timeouts

Looks like the topic diverged in side discussion, irrelevant to the issue.

The report was related to the fact that the dialog+acc is not recording the CDRs when sending the BYE on timeout. That is obviously an issue because there is dedicated functionality for this case. I am not the original developer of the feature, but it appears that it covered the case when dialog was not configured to send the BYE on timeout, just silenty discard the associated structure. So this has to be fixed. It is no relation with what proxy can do or not, sending BYE at the end of the dialog is not breaking anything in the existing dialog, it just terminates it on both sides.

Cheers,
Daniel

On 15/04/15 16:45, Alex Balashov wrote:
Hook, route, whatever you want to call it. The bottom line is that you cannot rely on the proxy's dialog layer, already a tenuous concept inasmuch as it's implemented strictly on top of transaction state specifically and derived solely from SIP signalling generally, to expose to you all conceivable outcomes, including outcomes that do not conform to a standard transition of dialog states.

The dialog module is just a tool. It cannot replace the fundamentals.

--
Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

Sent from my BlackBerry.



_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users


-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com



_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users


-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com