[Kamailio-Users] Registration Timeout Retransmission

[Klaus Darilion]

You have detected a potential problem with nonce_reuse disabled. That's 
why I always allow nonce_reuse. There might be other problems with 
REGISTER retransmissions too, e.g. if the retransmission arives to late, 
it will be rejected with "wrong CSeq" error.

A first workaround would be to send 100 trying back to the client, this 
should prevent retransmissions. You could also handle the REGISTER 
statefull (t_newtran()), but I think sending back "100 trying" should be 
sufficient.

regards
klaus

Am 12.02.2010 06:02, schrieb Hemanshu Patel:
> Hello to all users,
>
> I am very new to kamailio and just started using it. I have installed it
> and my phones are getting register successfully.
>
> But sometimes i am seeing a scenario, which makes my phones unusable for
> sometime.
> please see the condition as below
>
> | phone |--------------| Kamailio |
> | REGISTER----------------->
>     <----------------------401
> | REGISTER----------------->
> Tricky condition here
>
> | timeout<--------------200 OK
> phone shows itself as unregistered
> | REGISTER---------------->
>       <--------------------401
>
>
> After several retries phone stops to retry till say next 20 seconds,
> during that time though there's an entry in location table in kamailio (i
> am using mysql) my phone shows itself as unregistered phone.
>
>
> Due to load or any other conditions Server takes a bit time to send 200OK
> back to phone and During that time timer expires and phone sends REGISTER
> once again.
> now phone will keep sending REGISTER request with same nonse and other
> value, and kamailio is configured to not to entertained same credentials
> with nonce if it is authenticated once. So kamailio generates new 401
> Message with new nonce value to which phone understands as the previous
> reply thet he send for previous 401 was rejected, and the most probable
> reason is wrong user credentials.....
>
> Hope you guys have got my problem?
> i can not allow kamailio to let use the same credentials+ response with
> nonce if it has used it once for security reason. Then what could be the
> solution for this.
> I am very good in Programming, but just that i have just started to use
> kamailio and not very much aware about its architecture.
>
>