How to change "from-user" of gateway in dialplanxml

[duy.file]

can you help me, how to set "From-user" in dialplanxml,
I set in dialplan but not work,
<action application="set" data="from-user=0123456789"/>

 

[Adrian Fretwell]

I Believe it is common practice to leave the From User blank in the gateway and set the effective_caller_id* variables in the outbound route:

 

[duy.file]

I Believe it is common practice to leave the From User blank in the gateway and set the effective_caller_id* variables in the outbound route:

View attachment 3803

it don't work, thanks @Adrian Fretwell