Transformation rules on the Sonus 1k/2k SBC allow for manipulating the 'Calling Party Address/Number' field. The 'Calling Party' is who initiates the call. If we change the calling party from the users number to the number they want, that addresses their issue.
First, we create a transformation rule. Below are examples for both an e164 number and an extension:
Lastly, we'll also need to include a 'catch all' rule. The 'catch all' rule catches any other number and passes it through without manipulation. Below is an example: