[Serusers] loop call with asterisk

[Bogdan-Andrei IANCU]

glad to help :-)
bogdan

Richard wrote:

>I seem to be able to solve this problem by looking at ruri for the request.
>Besides checking the callid, I also compare the current ruri and existing
>ruri to see if it is indeed the same call.
>
>Thanks for leading me the right direction.
>
>Richard
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>>-----Original Message-----
>>From: Bogdan-Andrei IANCU [mailto:iancu at fokus.fraunhofer.de]
>>Sent: Tuesday, October 05, 2004 11:08 PM
>>To: Richard
>>Cc: serusers at lists.iptel.org
>>Subject: Re: [Serusers] loop call with asterisk
>>
>>Hi Richard,
>>
>>I guess it's a very thin line between a loop and a spiral. They are very
>>similar (even impossible to tell the difference from SIP point of view),
>>but first is harmful and the second useful :-).
>>I haven't went through the RFC, but IMHO is tricky for UAS detect
>>properly a loop - I guess that's way everybody relies on MAX_FORWARD to
>>end potential loops.
>>So, depends a lot of what *  consider a loop (how exactly does this) -
>>because, as you said, all important hdrs are the same. Btw, is at least
>>RURI changing between  outgoing and returning call ( on *) ?
>>The worst solution will be insert a very simple B2BUA in the middle to
>>change at least some tags. But is ugly :-(
>>
>>regards,
>>Bogdan
>>
>>
>>Richard wrote:
>>
>>    
>>
>>>Hi,
>>>
>>>I am trying to use * as a PSTN gateway. When a call comes in from PSTN,
>>>      
>>>
>>it
>>    
>>
>>>is forwarded to ser. If for some reason (e.g. call being forwarded back
>>>      
>>>
>>to
>>    
>>
>>>PSTN), ser will just do a record route and send it back to *. When * gets
>>>this call, it thinks it is a loop and drop the call. I know that this
>>>question has been raised before. I'd like to see, just from sip
>>>      
>>>
>>respective,
>>    
>>
>>>what's the theoretical way to solve it? Since all major fields are the
>>>      
>>>
>>same,
>>    
>>
>>>e.g. fromuri, touri, cseq, callid, what is the right way to detect loop
>>>      
>>>
>>in
>>    
>>
>>>SIP in this case? Btw, cisco router doesn't have this problem.
>>>
>>>Thanks,
>>>Richard
>>>
>>>
>>>
>>>
>>>_______________________________________________
>>>Serusers mailing list
>>>serusers at lists.iptel.org
>>>http://lists.iptel.org/mailman/listinfo/serusers
>>>
>>>
>>>
>>>      
>>>
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