Hi
@BABALUCHA
You will need to create an outbound rule for each caller ID you need to use and you will need to use a prefix for each outbound rule. You can optionally add an extension to limit the outbound rules to a specific extension.
View attachment 26981
Also remember to strip the prefix so the number is sent correctly to your provider. You will need to do this for all numbers you want to present as caller IDs.
The order matters if you have a more general outbound rule for all calls. You will need to order your outbound rules in such a way so that the correct is selected each time. The more restricted you make these outbound rules the less likely it is to chose the wrong one.
The last point you need to keep in mind is that your provider must accept these numbers caller IDs. Some provider will accept anything you through at them but some will only accept numbers that belong to your trunk and some will only accept the main trunk number as caller ID. This is something you will need to clarify with your provider.