The only time I heard distinctive ringing on an analogue line here thesedays is if you accidently hang up on a call that's on hold
If you hang up while there's a call on hold here you just get the normal double-ring (0.4 sec. on, 0.2 off, 0.4 on, 2.0 off).
We have a distinctive-ring service which provides a second number on the same line with single-burst ringing (1 sec. on, 2 secs. off). Unlike the old Bell CDO above though, the
caller still hears the regular double-burst ringback.
Apparently those old Bell System CDOs would allow you to dial
any of the numbers associated with a specific line, even if it was only single-party service. So if someone on a private line had 4931, so could still reach him with 4932, 4933 etc. and get the different cadences.
Multiple distinctive ringing undocumented and for free!
