TELECOM Digest OnLine - Sorted: Re: MF tones -- What, if Anything, Are They Still Used For?

Re: MF tones -- What, if Anything, Are They Still Used For?

Tim@Backhome.org
Wed, 26 Jan 2005 06:02:23 -0800

silvas_clinch@yahoo.com wrote:

> Hi everyone.

> I'm kind of curious about the MF tones I learned of recently, the ones
> that were used by the toll network of the 60's, 70's, and 80's to
> control how calls were routed.

They were also used for local trunk signalling between nearby central
offices even when toll wasn't involved. They were called "MF trunks"
as opposed to the older dial-pulse trunks. There might be some still
used that way in some rural areas somewhere. But, that is just
speculation on my part.

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