[SR-Users] Close TLS connection and Registrar Server (Kamailio V1.4.x)

[Klaus Darilion]

Hi Edson!

Recently Andrei reviewed the tcp_persistent_flag feature and expressed 
doubts that this probably never worked as it was expected to be. 
Probably he were correct.

As a workaround you can configure the maximum registration timeout and 
then set tcp_connection_lifetime to a value a few seconds more.

Also the client should send CRLF periodically to keep NAT bindings 
alive. If the client does not send CRLF you should set the maximum 
registration interval to a small value, e.g. 90seconds.

regards
klaus

edson.gomes.leme wrote:
> Hello,
> 
> We are using Kamailio V1.4 with TCP/TLS.
> 
> The Kamailio is configured the TCP lifetime to the expire value of the REGISTER by using the tcp_persistent_flag parameter of Kamailio's registrar module. Note: The SIP proxy should not close the TCP connection as it is not capable of opening a new one.
> 
> Kamailio tries to open a TLS connection to the client. The Kamailio should use the existing TLS/TCP connection that was established by the client during registration.
> 
> We are applying NAT traversal techniques to instruct Kamailio to reuse the established TCP/TLS connection. Example: for each register call fix_nated_register(). For every other request and response call fix_nated_contact().
> 
> I have got one SIP phone registered via TLS to kamailio-1.4.X version with Expires = 3600.
> 
> phone1: connected via ip1:port1 and Expires = 3600.
> 
> Example: After 15 minutes TLS connection is closed.
> 
> The SIP Phone opens a new TLS connection and registers via TLS to Kamailio. Thus, we have the following records on the Registrar Server (Kamailio):
> 
> phone1: connected via ip1:port1 and Expires = 2700 [3600 – (15 min * 60 s) = 2700].
> phone1: connected via ip1:port2 and Expires = 3600.
> 
> Is this the desirable behavior? Shouldn’t the Kamailio (Registrar Server) delete the below registry? 
> 
> phone1: connected via ip1:port1 and Expires = 2700 [3600 – (15 min * 60 s) = 2700].
> 
> Best regards!
> Edson G. Leme
> 
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