[OpenSIPS-Users] TCP Sockets Phones De-Register and then Quickly Re-Register.

Bogdan-Andrei Iancu bogdan at voice-system.ro
Tue Dec 28 19:59:56 CET 2010

Hi David,

With TCP, there is no need to have the TCP connection up during the 
whole duration of the registration - it is perfectly normal for the TCP 
conn to be terminated after REGISTER request (by server or client side).

For example, opensips has a timeout - for how long it should keep an 
unused TCP connection (see 

If the UAC is behind NAT, it is a bit of different story, as the TCP 
conn must stay open - the server cannot open later a TCP conn behind 
NAT. For such cases see:


David J. wrote:
> I am noticing a strange behavior on the phones.
> They are connecting over TCP; It seems like every 3 minutes they 
> quickly lose registration and then re-register.
> I am not sure if it is because the phone is sending a register every 3 
> minutes and then opensips is closing the old socket and opening a new 
> one or what?
> I dont have that much experience using TCP or how do troubleshoot this 
> problem.
> Thanks.
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Bogdan-Andrei Iancu
OpenSIPS Event - expo, conf, social, bootcamp
2 - 4 February 2011, ITExpo, Miami,  USA

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