TELECOM Digest OnLine - Sorted: Vtech Caller ID Not Working

Vtech Caller ID Not Working

Harlan Messinger (
Tue, 24 May 2005 21:06:43 -0400

I have a Vtech 20-2481 2.4 GHz Gigaphone two-line base unit with three
handsets. Until a few days ago, I had a two-line cord (RJ-45?) running
into the base unit's Line 1 + Line 2 jack. Last year I got rid of the
phone number that had been coming in on Line 1, but Line 2 continued
to work just fine.

The other day I replaced the phone cord with a one-line cord (RJ-11?)
running into the Line 2 jack. I pushed a splitter into the wall jack
and plugged the other end of the cord into the splitter's Line 2
output. Everything is fine now *except* that the Caller ID function
has quit. The caller is no longer identified, and no record is kept
in the call history.

I switched back to the earlier configuration and the Caller ID came
back. Then I returned to the one-line cord, and Caller ID vanished
again. The same is true when I plug the cord into the Line 1 jack on
the base unit instead of the Line 2 jack.

The reason I switched to a one-line cord is that I want to use the
Line 1 input for my new VoIP connection. That doesn't have anything to
do with the problem, though, because it occurs whether or not I have
the VoIP plugged into the base unit.

Any ideas on a solution?

[TELECOM Digest Editor's Note: Try the original (working correctly)
configuration but try disconnecting it at the wall box. You obviously
do not want to blow up the VOIP adapter box, but yet there seems to be
something about the way caller-ID gets delivered. On a one line jack,
usually the two 'middle' pins (pins 3-4 of six pins or pins 2-3 of a
four pin thing) delivers the 'first' line; the 'outer' pins (usually
pins 1 and 4 in a four pin plug or pins 2 and 5 of six pins) bring in
the 'second' line. It may well be that 'line 1' should have been the
one you kept while 'line 2' was disconnected when you took a line
out. Or if you can find a 'dummy' modular head (plastic head with pins
but no wire protruding) try sticking that dummy head in the line one
space. I know Radio Shack sells the little dummy heads, mostly they
are for guys who are building their own wiring setups, but you don't
need the wire, just the little pins to make contact in the
phone. That's jusy my 'try it next' idea. PAT]

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