[SR-Users] strange behavior when trying to reach PSTN gateway via TCP

Dmitry Petrakoff dimon at dprs-consulting.com
Thu Nov 17 08:59:04 CET 2011


Hi Daniel-Constantin!

On 17.11.11 10:56, Daniel-Constantin Mierla wrote:
> Hello,
>
> On 11/16/11 9:15 AM, Dmitry Petrakoff wrote:
>>   Hi Daniel-Constantin!
>>
>> Many thanks for your reply
>> Sorry for the wrong output from DEBUG.
>> I took it when such directives were set in config:
>>
>> #disable_tcp=yes
>> udp_mtu=1300
>> udp_mtu_try_proto=TCP
>>
>> Actually, that host 10.198.3.100 works just fine via UDP.
>>
>> But when those directives were enabled, next INVITE has gone there via
>> TCP and the error was the same as with Lync.
> yes, the question was if the host is able to take tcp since the
> conversion from tcp to udp is done by the sip server automatically
> when the size of the message exceeds udp mtu.
>
When both these udp_mtu and udp_mtu_try_proto are set, when server
receives INVITE from UAC via UDP with size more then set in udp_mtu,
then he tries to forward this INVITE to other party using TCP. But this
attempt  generates the same error when sending as you may see in my
previous posts.


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