Hello, I am test driving 3cx free edition (with intention to upgrade to paid edition if it works for us). I have been up and running in a limited sense now -- I am using voip.ms as the sip trunk and can make outgoing calls but there is no audio in the calls, specifically when placing a call to any destination (PSTN or another VOIP provider) I can not hear anything that is said on the other side. I can send DTMF tones from my side and the other party can hear them. I am using the 3cx soft client and also tried Counterpath X-10 and same problem. My server is behind a firewall (Not a NAT but an actual firewall) and has a public ip address. I opened up the appropriate ports (5060, etc...) and ran the firewall checker and it reported no issues. I can not figure this out -- please help! Thank you!