Be sure to configure security access controls for a DISA destination, at it opens the PBX up to outside callers.

Options for securing a DISA:

• Define PIN security codes for the DISA as a whole, or for each user (the later is better)

• If the DISA is reached through an inbound route, define incoming caller ID filters on the inbound route (see Inbound Routes Module). This is weaker security option as caller ID numbers can be faked.