I'm trying to set up a new talkswitch PBX, we had a bit of problems with the network in the office but everything is great now. 1. the PBX has been reset to factory settings. 2. we defined 2 ip extensions with user and passwords. 3. 3cx phones were set up and connected to the pbx. the connection is successful. 4. one phone is connected to the local network, and the other one is working on a computer outside the office. 5. when you place a call from one extension on another the phone rings, but you can't either side. we've tried everything. any idea on what should I check next?