[reSIProcate] NAT SIP keep alives

[Sergio García Murillo]

Hi all

I'm running a client behind a NAT firewall connected with an external proxy doing symmetric signaling to avoid the nat.
The problem is that after some short time the client stops receiving invites from the proxy because of the firewall drops the nat entry.
Is it possible to periodically send an empty packet to the proxy (a keep alive as x-lite does) to maintain the nat open at the firewall??
I can't use register whit short time values because the proxy rejects registering with shorts expiration values.

Greetings
		Sergio
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