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- Accept the voice call: since this channel has priority over VoIP, the secure call will go to the "hold" state and may be suspended when the voice call terminates.
- Refuse the voice call: the VoIP call remains connected and you can continue the secure
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- Android: The secure call audio is mixed with the ringings
- iPhone: The secure call is immediately put in an "on hold" state until the GSM call is closed.
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As soon as the "on hold" state starts, the party "on hold" hears some music. This music is performed by
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