This actually a new feature in CME 7.1, called whisper intercom.
From the Administrator Guide:
When a phone user dials a whisper intercom line, the called phone automatically answers using speakerphone mode, providing a one-way voice path from the caller to the called party, regardless of whether the called party is busy or idle.
Unlike the standard intercom feature, this feature allows an intercom call to a busy extension. The calling party can only be heard by the recipient. The original caller on the receiving phone does not hear the whisper page. The phone receiving a whisper page displays the extension and name of the party initiating the whisper page and Cisco Unified CME plays a zipzip tone before the called party hears the caller's voice. If the called party wants to speak to the caller, the called party selects the intercom line button on their phone. The lamp for intercom buttons are colored amber to indicate one-way audio for whisper intercom and green to indicate two-way audio for standard intercom.
You must configure a whisper intercom directory number for each phone that requires the Whisper Intercom feature. A whisper intercom directory number can place calls only to another whisper intercom directory number. Calls between a whisper intercom directory number and a standard directory number or intercom directory number are rejected with a busy tone.
When you press the softkey, you dial the number you would like to intercom with. This is the part of the feature that you're looking for.
ephone-dn 2 number 2001 ! ephone-dn 3 number 2002 ! ephone-dn 4 number A100 name **INTERCOM** intercom A101 label "**MANAGER**" ! ephone-dn 5 number A101 name **INTERCOM** intercom A100 label "**ASSISTANT**" ! ephone 2 mac-address 0015.F914.0C6E type 7960 button 1:2 2:4 ! ephone 3 mac-address 001A.6D0F.98DC type 7960 button 1:3 2:5
The result is the next:
1. An assistant on ephone 2 presses the button 2 (calls to manager) - on ephone 3 a manager deactivates mute and hears the assistant.
2. The manager on ephone 3 presses the button 2 (calls to assistant) - on ephone 2 the assistant deactivates mute but this time the assistant on ephone 2 doesn't hears what the manager says. At the same time the manager on ephone 3 hears what the assistant says.
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