Need an extension to use a specific outgoing DID number

I have 1 sip trunk with 5 DID numbers, I need 1 extension to call out on a specific DID number (i.e. not the default trunk number) is there away to do this.

for example (phone numbers altered for this example)

9199 1560 goes to extension 100 outgoing number set to 9199 1560
9199 1561 goes to extension 101 outgoing number set to 9199 1560
9199 1562 goes to extension 102 outgoing number set to 9199 1560
9199 1563 goes to extension 103 outgoing number set to 9199 1560
9199 1564 goes to extension 109 outgoing number needs to display 9199 1564 to a phone.

So when extension 109 calls another outside phone it will show 9199 1564 as the calling number.

Go into the extension on the PBX and set the outbound CID to whatever u want. Just make sure your carrier supports you sending the caller ID.

I tried that but it still announces the 9199 1560 as the calling number when I phone my mobile number.
I put in
<91991564>
in to the extension’s Outbound CID
Is this the correct syntax ?

Try it with just numbers but it sounds like to me your provider is not letting you set it.