Phone Model: iPhone OSv8.4 Generation: 4G Firmware Version: 2.41.00?? (modem firmware) Jailbreak: NO Cydia Installed: NO Issue Info ------------ Handset: Phone Contacts: Local Connection: 3G Server: external Have 3 iPhone users who have no audio (2way) when calling internal xtns. External calls are fine. The external xtn test calls have been to 3CXPhone clients on Windows/iPhone/and Android, all with same result no audio both ways. Any suggestions much appreciated. We are on a hosted 3CX server (v12), so all are outside LAN. - none of the test calls that had no audio were while connected to any Wifi networks.