Refer to the following exhibit.

The MGCP gateway has the following configurations:
called party transformation CSS HQ_cld_pty CSS (partition=HQ cld_pty.Pt) call.ng party
transformation CSS HQ_clng_pty CSS (partition=HQ_clng_pty Pt)

All translation patterns have the check box “Use Calling Party’s External Phone Number Mask”
enabled.
When the IP phone at extension 3001 places a call to 9011 49403021 56001# what is the resulting
called and calling number that is sent to the PSTN?

A.
The called number is 01 1 49403021 56001. The calling number will be 5553001 and number type
set to subscriber.

B.
The called number is 011 49403021 56001. The calling number will be 5215553001 and number
type set to national.

C.
The called number is 4940302156001 with number type set to international. The calling number
will be 5215553001 and number type set to national.

D.
The called number is +49403021 56001 with number type set to international. The calling number
will be 5215553001 and number type set to subscriber.

Explanation:
Check the check box “Use Calling Party’s External Phone Number Mask” if you want the full, external
phone number to be used for calling line identification (CLID) on outgoing calls. You may also
configure an External Phone Number Mask on all phone devices.
Link:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00805b6f33.
shtml