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Zyxel modem can make outgoing calls but not receive incoming

Posted on 2004-08-23
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Last Modified: 2012-05-05
I've had this problem for a long time, but I've always set it aside...

It's kind of hard to explain, but here it goes:

I've got an ISDN service at the office.

( I don't know if this is standart but with this ISDN service we got : 2 ISDN lines)

We've got 2 phone numbers. The "main" phone is plugged at one of the lines and works great.

We bought an analog portable phone and wanted to connect it to the "main" phone so that when we received a call both would ring.

As it was analog, we connected our ISDN modem (Zixel Omni.net Plus) to the ISDN line (2nd line) and connected the portable phone to the analog output/input of the modem so that the modem would convert the signal.

Here's what's happening:
I can make calls with the portable phone and the number shown on the receiver is the "main" number, but when I phone that number, only the "main" phone rings
If I call the secondary number, only the main phone rings as well.


I know it sounds confusing but give me some feedback on what you need cleared up and I will try to do that.

Thanks in advance
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Question by:b_loco
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Magistus earned 250 total points
ID: 11870588
Hi,

Funny enough, I thought from the beggining that the problem is connection issue, but after reading some background documentation about ISDN lines it seems that a specially made hardware (i.e. phone) is needed to ensure working on ISDN lines. Here's an example of such a device:
http://www.ericsson.com/enterprise/products/telephones_isdn.shtml

Furthermore, as for my humble understanding you'll only have one phoneline (and one phone number), but the advantage of ISDN is that you can use the same line for multiple process purpose (Phone+computer+fax+.....up to 7 devices).

Recheck this issue of two phone numbers, in any other case your network behavior is just like it suppose to be.
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by:b_loco
ID: 11870818
Thanks for the reply

I definitely have 2 distint phone numbers, but calling them makes the same phone ring.
 
And yes, our "main" phone is specially made for ISDN lines.
It was because the portable phone was analog that I used the zyxel, because the zyxel is capable of converting the signal.

The question is that only outgoing calls work, making me think that the modem is failing on the digital to analog conversion
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LVL 2

Author Comment

by:b_loco
ID: 11872482
Got it to work!

Just downloaded a Zixel utility that lets you set a phone number for each port of the modem. With this utility I set the analog port #1 to my main phone number and it worked.

As I got only one reply, it won't be very hard to give away the points ;)
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