[Serusers] Re: [Users] Detecting runaway calls

Bogdan-Andrei Iancu bogdan at voice-system.ro
Thu Oct 27 21:02:05 CEST 2005


Daryl,

normally, a PSTN provider who offer quality service must offer a way to 
detect hanged calls.
There is also a detection mechanism based on media (on GW) - at least 
CISCO GW have.

regards,
bogdan

Daryl Sanders wrote:

>This is exactly what I am trying to overcome. Do third party PSTN
>providers typically employ any other means of monitoring a call? I
>would think the would automatically disconnect the call after a
>certain amount of time if there was no media detected.
>
>On 10/27/05, Iqbal <iqbal at gigo.co.uk> wrote:
>  
>
>>problem with session timers, is if you have several different routes and
>>you dont control all the end gateways....then its a pain, so I would
>>think you would need a plan B, just in case to ensure you double
>>checked, but agree with bogdan, b2bua i great but I think the overhead
>>is not needed.
>>
>>Iqbal
>>
>>Bogdan-Andrei Iancu wrote:
>>
>>    
>>
>>>Hi Greg,
>>>
>>>that's the fortunate case of having already a B2BUA on the path :).
>>>But only for this particular case, I find the usage of a B2BUA a
>>>little bit to  "heavy"....
>>>
>>>Session Timer is actually doing a great job ;)
>>>
>>>regards,
>>>bogdan
>>>
>>>Greg Fausak wrote:
>>>
>>>      
>>>
>>>>The re-INVITEs definitely work.  I run some setups with
>>>>Jasomi inline (a commercial inline b2bua).  I configure them to
>>>>reINVITE, works like a charm.  If the reINVITE isn't answered (in either
>>>>direction) the Jasomi sends BYEs in both directions.  I believe other
>>>>commercial gear works that way.
>>>>
>>>>Also, I believe Session-Timers are supported by Cisco gateways, but
>>>>I don't have experience with those.
>>>>
>>>>-g
>>>>
>>>>
>>>>On 10/27/05, Daryl Sanders <daryl.sanders at gmail.com> wrote:
>>>>
>>>>
>>>>        
>>>>
>>>>>Thanks for the info guys! It sounds like I need to do a little reading
>>>>>up on cseq to determine if this will even work, or find a PSTN gateway
>>>>>provider that supports Session-Timers.
>>>>>
>>>>>- Daryl
>>>>>
>>>>>On 10/27/05, Bogdan-Andrei Iancu <bogdan at voice-system.ro> wrote:
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>>>by sending re-INVITEs from the middle of the path you will increase
>>>>>>the
>>>>>>cseq number differently on each side...so you will need to synchronize
>>>>>>the cseq value when some in-the-dialog requests are passing through
>>>>>>your
>>>>>>proxy....and that's quite complicated....
>>>>>>
>>>>>>regards,
>>>>>>bogdan
>>>>>>
>>>>>>Daryl Sanders wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>            
>>>>>>
>>>>>>>Would it be possible to fake a REINVITE then check the response to
>>>>>>>determine if a call is still in session? Just brainstorming...
>>>>>>>
>>>>>>>- Daryl
>>>>>>>              
>>>>>>>




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