ITU-T-Q.7 | Signalling Systems To Be Used for International Automatic &Semi-Automatic Telephone W | Document Center, Inc.

ITU-T-Q.7 › Signalling Systems To Be Used for International Automatic &Semi-Automatic Telephone W

ITU-T-Q.7 - 1980 EDITION - CURRENT

Signalling Systems To Be Used for International Automatic &Semi-Automatic Telephone W

ORDER

Document Number

ITU-T-Q.7

Revision Level

1980 EDITION

Status

Current

Publication Date

Nov. 1, 1980