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From: john@icjapan.info.com (John Higdon)
Newsgroups: comp.dcom.telecom
Subject: NTT Crossbar
Message-ID: <16154@accuvax.nwu.edu>
Date: 18 Jan 91 04:57:27 GMT
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Reply-To: John Higdon <john@bovine.ati.com>
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X-Telecom-Digest: Volume 11, Issue 45, Message 9 of 10


In a previous article I had incorrectly indicated that crossbar
switches used by NTT were incapable of DTMF operation. The confusion
arose from the fact that in the same manner as their electronic
switches, DTMF service is a class of service option.

Unlike DTMF service in the US, however, Japanese tone service is
exclusionary. If you have DTMF enabled, rotary dialing no longer
works.  In the US, rotary is universal and DTMF is sometimes optional.
In Japan, it is "either -- or".