[Asterisk-Users] Call Forward - 7940 Asterisk - Help

[c waddy]

I am looking for a simple way to forward calls unconditionally with 
Asterisk.
 We are running an Asterisk system with 10 extensions using SIP. One of our 
users leaves the office regulary, when she is out, she needs to be able to 
forward unconditionally to her mobile or collegue.
 I am trying to keep it as simple as possible, we use Cisco 7940's, they 
have a call forward option, when she uses it, "all" our incoming calls go to 
her mobile? Not just the calls to her extension.
 My Question: Does Call Forward on the Cisco Phones and Asterisk work? If so 
do I need to implement something into the dial plan.
 I have read on the wiki: 
http://www.voip-info.org/tiki-index.php?page=Asterisk%20call%20forwarding
 Is there an updated way to do this? I thought *21* was hard coded into 
Asterisk?
 If the Cisco phones wont work, i would like her to simply dial *21*<mobile 
number>#, any suggestions on this?
 Thanks.
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