To have a phone at home and the office you will need 2 separate extension numbers (two phones with the same extension will fight over inbound calls)
Example, Doug at extension 124 wants to have a phone that rings both at home and the office. Create an new extension like 224 as normal, with no voicemail. In the SIP ALIAS field put the original extension number 124. This way when he calls other internal users it shows his main extension 124. next go to FOLLOW ME settings and edit user 124. Both 124 & 224 should be in the Follow me list. set DESTINATION IF NO ANSWER to original voice mail 124.
* Adding mobile number to call me list – enter mobile number in EXTERNAL NUMBERS & check the box CONFIRM CALLS.
apply configuration changes and save
( optional add mobile phone number under external numbers)