[Users] Receiving different VIA in INVITE and CANCEL

[Bogdan-Andrei Iancu]

Hi George,

different VIA in INVITE and CANCEL brakes the specs of RFC 3261.  The 
"via1_matching" is a kind of a trick to make un-compliant clients to 
work. The trick is functional. I suspect that maybe not only the VIA is 
the problem. Can you please post the INVITE and CANCEL to have a look on 
them?

regards,
bogdan

Papadopoulos Georgios wrote:

>Hello,
>
>I have an issue with some user agents, (Linksys PAP2 and Sipura 3000)
>sending different Via in CANCEL than in INVITE.
>Of course the result is that the caller hangs up and the callee keeps
>ringing.
>I tried to use
>	modparam("tm", "via1_matching", 0)
>but it did not solve the problem. 
>
>I have two questions:
>1. Is the via1_matching in TM working as described or is it broken?
>
>2. What can be causing this behavior of the user agent? Not all our
>users who have these user agents report this problem (actually very few
>have the problem). In our lab we tried same user agent, same firmware
>but could never reproduce this behavior no matter how bad we tried to
>mess up their configuration. 
>
>Any help will be greatly appreciated. Thanks.
>
>George
>
>
>
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