I have a CCM and a H323-gateway at the office. The gateway has a E1 ISDN out\nto the PSTN. I have now tried to install a Firewall between the\nCCM/IP-phones and the Gateway.\n\nOutgoing calls to pstn works fine with the FW in between, but incoming calls\ndoes not. The call reaches the phone, but gets immidiately disconnected, and\nI can see 1 missed call on the phone.The caller gets the ringback tone, but\nthe phone does not ring.\n\nThe FW only has one rule at the moment, permit any any. I can not see any\ntraffic from/to my phone being dropped on the FW. Routing works fine between\nCCM/FW/gateway/phones.\n\nWhere should I start looking for the problem?