outgoing rules for sending the phone number

[ickbindat]

I use the trial version, Small-Business. on a Mac.
I have set up one user and 2 SIP trunks.

On the Mobile iPhone 11, I would now like to choose which phone number I use to call out. The same number is always displayed.
What do I have to set in the outgoing rules so that the number of the connection used is always shown?

 

[TheodorosG_3CX]

Note that DID numbers are only for inbound call and not for outbound.
In this case you need to configure an outbound caller id, however this depends also on whether the provider support this functionality or not.