In article ,
Peter Parry writes:
On 19 Nov 2006 17:40:18 GMT, (Andrew
Gabriel) wrote:
There's also
an off-hook signalling method which is used during call
waiting, but that requires that the phone indicates it can
take the data when off-hook, or it's not sent.

Has that ever been implemented? I was under the impression it wasn't
used (or it may just be that not many phones can use it).

It is implemented, but I don't think many phones support it.
Separate caller display units can't use it, as it is necessary
to momentarily cut off the audio path whilst receiving the
callerid data, so the feature needs to be integrated in the
phone.

--
Andrew Gabriel