hi, currently, in the registration process we setup expire time and re-register when time is expire. this serve the sip server to update his tables but also to preserve the hole in the NAT. usually time for this is 360 sec. I expirience some times where i make a call and the request doesn't comes very quickly. I suspect that the udp hole in the NAT has been closed. I can reduce the expire time but is there a way just to send some dummy msg to the sip server just for the NAT? thanks, -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20100223/d46582ac/attachment.html>