I have got to establish a SIP trunk between ccm6.0.1 and some Patton SN4960. My problem is my trunk is functionning in a single direction. Meaning when i call an ip phone registred with the patton gateway it works fine but when ip phone registred with the patton gateway tries to place a call to an ip phone registred with my ccm it doesn't work. when i tried to troubleshoot the problem I noticed that the trunk was up in both directions but i 've got a very strange error which is /SIP/2.0 404 not found when the patton tries to place a call. I am wondering if there is something wrong with my ccm kinda it is not able to terminate sip connections.