not accepting incoming calls

Hi,
I have a very strange problem.
I can dial out through a sip trunk and recieve incoming calls through the same sip trunk.
But if I haven't dial out for about 1-2 minutes I can't recieve any incoming calls anymore until I dial out again.
Does anyone know what the problem could be or where I need to look for this problem?
Thanks for your help.
Martijn
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Sounds like a networking
Sounds like a networking problem where the arp cache or something is getting cleared through normal usage. An incoming call, sets up the cache which after a preset time like 300 sec then clears itself. I would check your default gateway settings, DNS settings, etc..
Eugene Blanchard
Author of PBX in a Flash for Newbies and Introduction to Data Communications
Sounds like a registration
Sounds like a registration issue with you provider.
Moshe Brevda, FreePBX/Schmooze Com Development Team