[SIP Beyond VoIP] STUN keep-alive

[Adrian Georgescu]

Hi Inaki,

Blink does already keep alive the TCP connections, PJSIP has this feature built-in.  It does not do this for UDP though, we expect the server to do this. I imagine that if the server does not take care of this keep-alive task on its own is not possible to provide a reliable service. 

Do you know by any chance what Outbound is providing extra in comparison to SIP servers keep-alive mechanisms developed prior to it? 

Adrian


On Jan 16, 2012, at 12:39 PM, Iñaki Baz Castillo wrote:

> 2012/1/15 Adrian Georgescu <ag at ag-projects.com>:
>> Your SIP server must be able to keep the NAT open. See OpenSIPS nat
>> traversal module as an example, each SIP server has a similar mechanism.
>> Without support from the server you you will not be able to do it.
> 
> If Blink would implement Outbound then it would send periodic doble
> CRLF (in TCP) or STUN requests (UDP) to the server, which should
> implement it as well.
> 
> -- 
> Iñaki Baz Castillo
> <ibc at aliax.net>
>