Under the phone you can put an external phone number mask and then on route patterns you can check the option for sending External phone number mask. THis can also be done at route list level, to allow the external phone number mask to be passed out to PSTN. Please note that you would eitehr do this only at route pattern level or Route list level and not both.
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus
