KX-TDA50 ICM Group Forward - Sundance Business VOIP Telephone Help

I have KX-TDA50 without VM...I'm trying to forward all ICM group 601 calls offnet to a cell phone. I setup a onetouch button on the phone, but it is still not working. Here is the code that I'm using
*7151 phone#

You need to use *71416019 phone no # and make sure the system cos allows fwd external

I will try that. Thanks so much for your help.