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Unity Callhandler transfer to a subscriber extension

If a callhandler needs to transfer to a subscriber's extension (ring his extension)…
 a. Say when  key 1 is pressed, do an attempt transfer to subscriber.
 b. Under the actual subscriber Call transfer settings, set it to ring subscriber's extension, rather than sending it to his greeting. (Very crucial)

Under caller input page, lock a key (0 through 9, * #) to a particular action if you want Unity to perform that action as soon as you press that key. The “Allow callers to dial an extension during greeting” has no effect if the keys are locked. To allow callers to dial an extension during the greeting, don't lock the key to a particular action

 If you have any of your keys set to Ignore key, the greeting that is played is usually System greeting “I do not recognize that as a valid selection”. This is the Error greeting. Expose the Error greeting using Advanced Settings tool from Tools Depot and you can re-record the Error greeting to a message of your choice.