Moved my 3CX (9) install over from an old Win Server 2003 Standard installation to a new Win SBS 2011 Standard installation and running into the following issue: Outbound (External) calls through a Patton SN4114 gateway (PSTN) provide no audio to either party. The call connects, but neither end can hear each other! Seemingly 1 out of 4 or 5 calls will result in audio and no issues, but the rest of the time - nothing! What WILL work, is calling from the outside world in. I am able to connect and receive audio on both the local handset and externally calling device. I have noted that when the call connects but receives no audio, it does not show that any of the lines are in use on 3CX, but does show on the Patton itself... wwWWIIEEEeerrdd... I have done the following: - Disabled SBS 2011 Firewall - Tried (on both Extensions and the Patton) a combination of "PBX delivers audio" - Re-Exporting/Importing Patton config - Tried enabling the firewall and opening ports - Monkeyed with handset codec order - Tried a 3CX phone over 3CX tunnel (this actually yielded slightly better results) - Tried kicking it - Performed an exorcism - Drowned my sorrows - Cried in the fetal position - Talked to a therapist If anyone has any better suggestions, it would be greatly appreciated. If you need more details - please let me know!