Hi, I'm using kamailio as a load balancer to dispatch to 5 asterisk Media gateways with pjsip Stack The old asterisk sip Stack is turned off. hier my asterisk pjsip.conf to trust kamailios IP Addr. pjsip.conf [transport-udp] type=transport protocol=udp bind=0.0.0.0:5060 tos=cs3 cos=3 [kamailio] type=endpoint context=outgoing-kamailio disallow=all allow=g722,alaw,ulaw transport=transport-udp direct_media=no disable_direct_media_on_nat=yes aors=kamailio [kamailio] type=aor qualify_frequency=60 [kamailio] type=identify endpoint=kamailio match=[IP-Addr-of-your-kamailio] extensions.conf exten => _XXXX.,1,Dial(PJSIP/${EXTEN}@trunkprofil) od exten => _XXXX.,1,Dial(PJSIP/trunkprofil/${EXTEN}) works great and pjsip is very fast !!! love it !!! Regards Rainer -- *Rainer Piper* Integration engineer Koeslinstr. 56 53123 BONN GERMANY Phone: +49 228 97167161 <callto:004922897167161>