[OpenSIPS-Users] Failed INVITE tcp_send to UDP UACs

Bogdan-Andrei Iancu bogdan at voice-system.ro
Mon Jan 25 12:13:38 CET 2010

opensipslist at encambio.com wrote:
> Hello Bogdan,
> An mar., déc  22, 2009, Bogdan-Andrei Iancu schrieb:
>> opensipslist at encambio.com wrote:
>>>>> But this is maybe a clue. It would seem that something in TLS
>>>>> writing has changed between these two versions, maybe fundementally?
>>>> 1.3 was doing infinite loop (for write and read), leading sometime to 
>>>> blocking.
>>> That was a painful part of 1.3, so good that the counter is there
>>> now. I guess you're saying that the same TLS problems existed in
>>> 1.3 as well, but they were masked by retries (maybe thousands.)
>> yes, that is correct.
> Can it be that when the internal OpenSIPS TCP lifetime counter is
> set to the registration interval using the tcp_persistent_flag that
> this counter is used even when the registration forcefully expires?
> What I mean by forcefully is:
>   Some IP phones don't wait for a registration period to time out.
>   Instead they wait for 1/2 of the expiry period and then send a
>   new REGISTER with a header 'Expires: 0' to force the registration
>   to timeout. Then they immediately send a new REGISTER with a
>   normal expiry value to obtain a new registration.
> ...so if an expiry time is 10 minutes, after only 5 minutes the UAC
> invalidates the registration and makes a new one.
> I'm wondering if OpenSIPS tries opening TCP connections using the
> value of 10 minutes with a UAC which is no longer in the location
> table because the AOR was removed (due to the principle described
> above.)
> Possible?
What you suggest is that opensips originally intends to keep both 
registration and TCP connection for 10 mins, but the registration is 
removed after 5 mins while the connection is still alive for the next 5 
more mins  ? This is possible, but I see no harm. If the client still 
wants to use the old conn, it will be ok if opensips re-uses the old 
connection. If not, the client will close it and opensips will not use 
it any more.


Bogdan-Andrei Iancu

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