Tone play related correction

• Play a beep before hangup when the remote hangs up.
• Stop playing the congestion tone from the extension, just wait for 5s that the voicemngr plays the tone.
• Re-arrange a bit with the cbbs sequence, so we have 5s busy tone played from voicemngr when cbbs is disabled.

Together with:
https://dev.iopsys.eu/voice/dectmngr/-/merge_requests/47
voice/voicemngr!16 (merged)