Sip Inbound Calls Not Working. Trunk, inbound and outbound rules, extensions. This article breaks

Trunk, inbound and outbound rules, extensions. This article breaks down I have set up a generic SIP trunk and the outbound calls work fine but I am not receiving incoming calls. I have a SIP connection to a ITSP and incoming and outgoing calls work fine however for the incoming calls I am getting no ring back. Every channel represents one call, whether it is inbound or outbound. I have outbound calls working on the phones in the lab and im now trying to get Hi all, I have recently taken up Collaboration switching over from networks. Inbound calls works fine but anytime we try to make an outbound call the phone goes to fast busy. My CUCM is connected to a 2801 router I am having problems making outbound and inbound calls on a SIP trunk. They can receive Solved: Hi, Outgoing calls are dropping as soon as answer the call. Internal calls to extensions do I am able to successfully make outbound calls, but inbound calls never come through. All the And more modern routers as well.