Beeping Sound on Glocom/Communicator Go (version 7+)
If a Communicator Go user reports hearing a beeping or call waiting beep while on a call, the sound is likely caused by the following feature:
Audio notifications for network related changes during a call
When a network is disconnected during a call or when WiFi < - > mobile network switch occurs,
users will hear a beep sound.
This sound does NOT indicate another incoming call (call waiting), it simply means your phone has disconnected from one type of connection (WiFi or mobile network) and has switched to a new type of connection.