[Serusers] if power failure happens in UA while call is in progress, Ser accounts wrong

[Ricardo Carvalho]

After spending some time searching about this problem, It seams that 
there are 2 options to solve it:

* configure an appropriate RTP timeout on the gateway. For instance, a 
if there is no packets after 10 seconds,  cancel the call.

* configure Ser to modify Session Headers setting an onreply_route with 
the following code which "emulates" session-timer support in the user 
agent that sent 200 OK:

##########################################################
if (status =~ "2[0-9][0-9]") {
   	remove_hf("Session-Expires");
 	append_hf("Session-Expires: 120;refresher=UAC\r\n");
   };
##########################################################

Some people say that this implementation is a violation of the 
Session-Timer draft, and because of that, it's a workaround that only 
works with some gateways... I use Asterisk as my PSTN gateway...

For those like me that use Ser+Asterisk, which of these options to solve 
this problem do you recommend me? Is there other way that I haven't 
found to solve it? Should I trust the emulation of session-timer in Ser? 
wouldn't it give me trouble in the future?

Thanks in advance,
Ricardo.





Greger V. Teigre wrote:

> This matter has been discussed throughly on the list, more than once. 
> Do a search on "BYE accounting" and I'm sure you get plenty of hits.
> http://iptel.org/listsearch
> g-)
>
> Andreas Wernitz wrote:
>> Ricardo Carvalho wrote:
>>> Meanwhile I was making my scripts for management of the accounting, 
>>> I realized and after some call has been answered if the called party 
>>> simply has a power failure or network failure, no BYE message ever 
>>> gets returned to the other party, what results in the acc table in 
>>> one ACK message and after that no more messages belonging to that 
>>> call-id. This can mean erroneously that the call is still in 
>>> progress eternally, resulting in an enormous  billing to the caller!!
>>> This is a very serious issue! How can I protect my system from this 
>>> kind of problems?
>>>
>> if you are billing onnet calls, you're lost. if you bill calls to the 
>> PSTN,
>> you can try to correlate your accounting data with accounting data
>> provided by the gateway.
>>
>> perhaps your gateway provider does offer Session Timer ?
>>
>>
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>>
>