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?

William Warren (william_warren_nonoise@comcast.net)
Sat, 22 Jan 2005 18:00:21 -0500

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.

> While I understand they are no longer used for call routing, are these
> tones still used today for other things, and if so, what? (I'm
> referring specifically to either the R1 or R2 tone plans, or something
> close to them.)

MF is still used for some E911 trunks, for interconnect with ILEC's
that request it, and for some PBX DID lines. I don't know about "R1"
or "R2".

HTH.

William

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