May 31, 2007


Ammy Hill, IT Service Campus Readiness Specialist: (650)736-0895,


Jay Kohn, Executive Director, Shared Communication Services: (650)723-7515,

Relevant Web URLs:

IT Services Changes PBN Requirements

As a part of an IT Services initiative to improve client satisfaction, Stanford telephones will no longer require a Personal Billing Number (PBN) for domestic long distance calls as of June1st, 2007.

PBNs will still be required for international long distance calls and other specialty toll calls like 411, 900 numbers, and 976 numbers. Telephones will no longer prompt users to enter a PBN when making domestic calls including Alaska, Hawaii, Puerto Rico, and the Virgin Islands.

This change will affect both University and Hospital telephones on June 1st, 2007. Telephones in the student residences will be updated after Commencement on June 28th, 2007.

A PBN is the seven digit authorization code that must be entered to complete a long distance call. It is prompted by four staccato dial tone pulses.

Business phones were switched to a flat-rate billing model for all local and domestic long distance calls in September 2004. At that time, the requirement for PBN entry was kept to ensure that calls were made by authorized Stanford staff and faculty. In an effort to streamline the calling process and reduce the need for generating a PBN for all staff, faculty and hospital residents, the PBNs are now only required for calls that will incur a charge.

IT Services is the University's central information technology service-providing organization. Every day, its staff works to make sure that infrastructure and application portfolios meet the institution's needs by improving wiring, adding more storage to servers, upgrading applications to meet new requirements, and replacing outdated services with new ones. Running, maintaining, and continually improving these services — and doing so cost-efficiently — is the core business of the IT Services organization.


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