Ringing phones connected in parallel

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aawc:
Hi guys,

I have a question and I have spent a couple of hours trying to find the answer to it, including searching existing posts, but no luck so far. So here it goes:

Setup:
I have an Obi110, and I have connected a splitter to its phone port. One of the outputs of this splitter is directly connected to a phone instrument and the other is connected to the Telco wiring in my house (3 parallel phone instruments).

Problem:
I can use any of the phone instruments (3+1) to make and receive calls, but on incoming calls, only one phone rings, the one directly connected to the splitter. What do you think is causing this?

Here's a diagram of my setup: http://dl.dropbox.com/u/8297858/Obi110RingProblem.PNG

Thanks in advance!

RonR:
Is the telco wiring in your house disconnected from your outside telco line?  You must not connect a live telco line to the PHONE Port of an OBi.  Doing so could potentially damage the OBi.  A live telco line must be plugged into the OBi's LINE Port.

aawc:
The line from Telco comes in only into the "Line" port on Obi110.
The "Phone" port, which is an output port on Obi110, is connected to the splitter.

I have updated the box diagram to reflect this.
http://dl.dropbox.com/u/8297858/Obi110RingProblem.PNG

EDIT: Adding the image inline for future reference.

Thanks

RonR:
I'd try connecting only my house wiring to the OBi PHONE Port and only connect one of the three phones at a time to see if each/any works properly by itself.  Then I'd add additional phones, one at a time, and see if they continue to work.  It could be a loading (REN) problem.

aawc:
If I connect the telco line directly to the splitter, all phones ring.
This makes me think: Could the problem be related to the voltage of the phone out port?

I'll try connecting the instruments one at a time to see if each of them rings individually and report back.

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