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From: Richmond <dnomhcir@gmx.com>
Newsgroups: uk.telecom
Subject: Re: Engaged tone
Date: Sun, 19 Apr 2026 21:56:38 +0100
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David Woolley <david@ex.djwhome.demon.invalid> writes:

> On 19/04/2026 14:11, Richmond wrote:
>> ___ _ ___ _
>>
> This is "equipment engaged", and is the tone equivalent of "all lines
> to xxxx are busy, please try again later".  Done correctly, one length
> is louder than the other.
>
>> __ __ __ __ __
> This is "subscriber engaged", where the phone is ringing or off hook.
>
> "Number unobtainable", which is what you are looking for, is a
> continuous tone, although normally replaced by a voice announcement.

On my router there are two phone sockets and these have internal phone
numbers **11 and **12 , so if I phone **11 from phone 1 I get a tone
which is actually the equipment engaged tone above, but it must be
coming from my router I guess because such a call need not go outside
the router. Or maybe these tones are actually transmitted as error code
and are then always translated into tones by the VOIP receiver or
router?