If I remember correctly, pjsip sends CRLF packets every 30 or 60 seconds. Also you could configure a STUN server - this will cause STUN message every 20 or 30 seconds which keep the pinhole open. regards klaus Am 23.02.2010 11:54, schrieb nir elkayam: > 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, > > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org