Hello, Is there a function in nathelper to detect whether the called party is behind NAT or not? This is useful to decide if RTPProxy should be used or not. Nathelper maintains somehow this information in memory in order to UDP ping the phones behind NAT. Regards, Adrian Georgescu ag(a)ag-projects.com http://ag-projects.com Tel: +31-23-5458104 IP phone: sip:ag@ag-projects.com ------------------------------------------------ DNS, ENUM & IP telephony http://managed-dns.org/