Jono wrote :

>>
>> i.e. When in the office, dial 9 then the number and have the CLID of
>> the office line, if I dial a prefix of 8 then use the home number or 7
>> to send the mobile CLID so I can claim not to be in the office.
>>
>> Sure someone will come up with a solution!
>
> Three outbound routes.
>
> 1st 9|.
> 2nd 8|.
> 3rd 07.

Although, you would also need to set up three (almost) identical trunks
& put the fromuser= bit back in.

That way, your route 9|. can go to the trunk masquerading as your
office line, route 07. can go to mobile trunk etc.