Is it possible to manipulate the pings (OPTIONS in my case) to force a source ip:port combo per destination? dispartcher.list: 1 sip:192.168.0.1:5060 2 sip:192.168.1.1:5070 3 sip:192.168.2.1:5050 The kamailio (4.1) is listening on 192.168.3.1 5060 and 5070. dispatcher 2 cares about the source port, which should be 5070. 1 and 3 don't care. -- POCOS B.V. - Croy 9c - 5653 LC Eindhoven Telefoon: 040 293 8661 - Fax: 040 293 8658 http://www.pocos.nl/ - http://www.sipo.nl/ K.v.K. Eindhoven 17097024