Telos ZephyrExpress Northern Pittsburgh Tele- phone, Nynex, Pacific Bell, Southwestern Bell

GTE

XXXYYYZZZZ0101

— or — 01YYYZZZZ000

— or —

XXXYYYZZZZ00

— or —

SPID1 XXXYYYZZZZ01 SPID2 XXXYYYZZZZ02

Northern Pittsburgh Tele- phone

XXXYYYZZZZ000

Nynex

See BellAtlantic

Pacific Bell

XXXYYYZZZZ0101

— or —

SPID1 XXXYYYZZZZ01

SPID2 XXXYYYZZZZ02

— or — 01YYYZZZZ000

— or —

SPID1 XXXYYYZZZZ1

SNET (Southern New England Telephone)

01YYYZZZZ00

Southwestern Bell

XXXYYYZZZZ0101

— or — 01YYYZZZZ000

— or — 01YYYZZZZ00

— or —

XXXYYYZZZZ01

Sprint/Centel

XXXYYYZZZZ100

— or —

XXXYYYZZZZ1

— or —

SPID1 XXXYYYZZZZ000 SPID2 XXXYYYZZZZ100

US West

XXXYYYZZZZ1111

— or — 01YYYZZZZ00

— or — 01YYYZZZZ000

ISDN BRI, ZEPHYR, AND YOU

This section applies to users in North America and is intended to help you when you or- der your ISDN line. We assume you have read the description of ISDN in section 8, and are familiar with ISDN’s basic concepts. If you haven’t read that section, do it now. It’ll help you understand the following information better.

ISDN (Integrated Services Digital Network) is the information superhighway at your front door. Because ISDN has only been recently introduced in some parts of the coun- try, there is a great deal of confusion about what it is and how to get it. If you know who to call and provide them with complete information, the ISDN ordering process can be simple and straightforward. This guide takes you through the process step-by-step. Telos Customer Support is available by phone or fax to answer any further questions you may have.

11-10 APPENDIX