[SIP Beyond VoIP] STUN keep-alive

[Adrian Georgescu]

On Jan 17, 2012, at 9:43 AM, Mihai Richard wrote:

> In this case, from the sipsimple's interface point of view, how do I make it
> periodically send that UDP packet to the server? I expect to have some kind
> of setting for that but I don't know what it is.
> 
> #
> U 192.168.33.166:5060 -> 69.61.11.18:5060
> .
> 
> #
> U 192.168.33.166:5060 -> 69.61.11.18:5060
> .
> 
> These are the UDP packets shown by ngrep. Apparently the client just sends 1
> byte at a time and in return the server sends an OPTIONS message.

The client does not send such packets. The server does not respond to something, it generates those options periodically on its own regardless of what the client does or does not.

You have a nasty intermediary breaking your SIP traffic, most likely is your own router. Disable SIP ALG in your router to make sure it does not interfere.

Adrian