Assuming you are in callmanager 4.x+, you could set up a translation pattern to intercept the call, replace the calling party number with something generic, and then pass it on to the phone. just takes some monkeying with CSS/partitions to grab the call - depends on how your system is set up though.
<br><br><div class="gmail_quote">On Nov 30, 2007 8:41 AM, Marcus Smith <<a href="mailto:msmith@laurinburg.org">msmith@laurinburg.org</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff">
<div><font face="Arial" size="2">Good Morning All,</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">How can I mask/hide an incoming caller phone number
from being displayed on a ip 7940 for a certain extension. This phone(ext:
3331) will be the crimestopper line, and we cannot have access to the
phone number of a caller leaving information about a crime.</font></div>
<div><font face="Arial" size="2">Thank You,</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Marcus Smith</font></div></div>
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https://puck.nether.net/mailman/listinfo/cisco-voip</a><br></blockquote></div><br><br clear="all"><br>-- <br>Ed Leatherman<br>Senior Voice Engineer<br>West Virginia University<br>Telecommunications and Network Operations