Hi Jerome,

The ability to change this behaviour depends what version of UC you are running.

If it's 1.x "Windows" (yes - see below) if it's 2.x, like you are running (no - due to needing the Linux Root password). In the newly released UC 7.0 the ability to turn this On/Off is built-in like in the newest Unity versions.

Disabling the "Wait While I Transfer Your Call" Prompt

By default, Cisco Unity Connection plays the "Wait while I transfer your call" prompt when it transfers a call to an extension. Some callers do not like hearing the prompt, and for this reason, you may want to specify that Connection does not play it.

You configure whether or not the prompt will be played on the Edit Transfer Rule page for a specific user or call handler transfer rule.

Release Notes for Cisco Unity Connection Release 7.0(1)

http://www.cisco.com/en/US/docs/voice_ip_comm/connection/7x/release/notes/701cucrn.html#wp81767

To delete the "Please wait while we transfer your call" message;

For Unity versions prior to 4.1 (and UC 1.x) here is an excellent answer from Jeff @ Cisco;

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=Unified%20Communications%20Applications&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1dd9a0d8/0#selected_message

Hope this helps!

Rob