Elcon NT1+2a/b - Extended Functions

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If you have still a waiting partner and your active partner hooks on, you will hear a
disconnect tone . If you now hook on your receiver  and the second partner is
still waiting, the NT1+2a/b will
Remind you of the call in hold state:

Your telephone is now ringing continuously for about 10 seconds. If you hook off
 within this time, you will be connected with the call on hold. Otherwise this call
will be cleared.
If you have an active call and a call on hold and you hook on  your receiver first,
then the active call will be cleared and the NT1+2a/b will remind you of the waiting
call in the same way as described above.
There is still another way to retrieve a waiting call after your active partner has
hooked on and you hear the disconnect tone. If you haven‘t hooked on yet,
you can
Switch to the waiting call: (with no call active)
 ®  
If the waiting call was already cleared, you will hear the disconnect tone for a short
time overlaid with  and you should hook on  at this point.
5.5.2 Extended functions
There are still some functions for clearing calls if you have an active and a call on
hold. But note the following.
Disconnect the hold call:
  ®  
The partner still on hold will now hear the disconnect tone. You can continue your
present call.
Terminate the active call and switch to the one on hold:
  ®  
You are now connected to the call on hold. Your first partner will now hear the
disconnect tone.