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Issue description: The call is disconnected from VoIP side and it takes up to 30 seconds before the call is disconnected in GSM side. This typically happens if a voice mail is reached. If you make a test call to your cell phone, you can hear a busy tone.

This behavior can be caused by PBX settings or by 2N® VoiceBlue Next settings.

Please check following page:

Generate busy tone to GSM/UMTS  is used to simulate an analogue line where you get a busy tone after disconnection. If you want the immediate disconnection, set this parameter to Disabled.

Similar settings could be necessary on PBX side.

More product information:

  • 2N® VoiceBlue Next (Official Website 2N)