D816 Internal ISDN problem - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

jochem · 02-25-2008, 06:35 PM

I have been sitting on this one all day now, maybe someone here can help me. I've got a Panasonic D816 here with the KX-TD286 ISDN Card. I'm using 4 of the ISDN ports for the external lines and i'm trying now to use the other 2 ports as internal ISDN ports.
I've connected a Teles Zephyr ISDN codec (audio device used at radio stations to transmit audio over ISDN) to a internal ISDN port.
The port is configured as folowing:
Line Setup
Line Type: Extension
L1 Mode: Call
L2 Mode: Call
Access Mode: P-MP
TEI Assign: Automatic
MSN Service: Disable
Extension Tone: Enable
Station Menu -> ISDN Internal 1
EXT: 195

Dialing out with de ISDN Device is no problem. Dialing in is a different story.
When i dial 195 from a internal phone (Panasonic KX-T7533) i can here the phone ringing (It sounds like i'm calling someone). When i look at the ISDN device it is not ringing.
When i dial in from an external line to the number is forwarded to extension 195 i can see a line comming in the PBX (a CO line is turning on) but i don't here anything on the phone i'm holding in my hand. After a couple of seconds the line is disconnected.

2 Questions now:
1: Is it posible what i want to do?
2: What am i doing wrong? (If it is even posible).

I hope someone here can help me.

OBT · 02-26-2008, 02:51 AM

If you can dial out it sounds like the extension is working. the settings you have look fine. set up a dss button for ext 195 to see if the extension is trying to ring.
Does the device have terminal adaptor built-in. If you ring a ISDN device from a analouge phone even from external through a ISDN line it will not answer a voice call. do you have a ISDN modem with analogue ports or a isnd telephone to test it with.

If you have terminal output from the device you are using, have you reset the system after programming it.

jochem · 02-26-2008, 04:32 AM

Hmm, i'll try this maybe i will get lucky. The DSS button is a good tip!
I've called the ISDN line with a ISDN phone from a other line that is not attached to the pbx. Unfortanately i can't use the isdn phone on the internal ISDN lines since the internal lines do not privide power over isdn.
I know the ISDN device should ring if the line ringes. Even when it's a voice call. It just doesn't pick up the line when it's a voice call (At least that is what is does directly on a 'normal' ISDN line).

Thanks for the tips.

OBT · 02-26-2008, 05:09 AM

Yes but the direct isdn line may have a analouge adaptor built in to the isdn box, we have 2 types here one is isdn only and the other is a plug and play with 2 analouge line adaptors built in, if you ring a in as a voice call it will ring on the adaptor even if no isdn devices are attached.

Note: even though you are using a isdn phone to ring in, it still classed as a voice call,you would need two isdn devices that will have the software to talk to each other before getting a connection, just like you said it will ring in but when they can't communicate with each other it drops the call.

Dont use a forward from another extension either, set up a ddi to ring directly to ext 195, If you have 4 isdn incoming you should have 8 numbers , use one that is not normaly dialed

jochem · 02-26-2008, 05:53 AM

The story continues

I've now attached a second Telos to the other internal ISDN bus (197). When i dial a data connection from one telos to the other i can see the line ringing but is doesn't get picked up.

I thought to fix this before trying dialing in from an outside line.

I've enabled the MSN Service on the internal ISDN line. The MSN setting in the telos is set to 1951 for the first line and 1952 for the second line.

One detail i forgot to mention, the PBX is hooked up to a Patton smart-node multiport isdn IAD. This is hooked up to a fiber connection. Could this cause a problem with data cals?

OBT · 02-26-2008, 06:45 AM

I can't see any problems with it being on a smart node, if it is set up by the provider to allow data.( saying that I have not come accross basic rate isdn on a node before, only PRI)

Good idea to get the 2 internal isdn phones to ring before trying to get in from outside, but I think setting up MSN might only complicate it,

jochem · 02-26-2008, 07:07 AM

I found the problem with the outside line dialing in. I connected a old NT1 to the internal ISDN for power supply and hooked up a ISDN phone and a Telos to this line.
Dialed in from an external line with another Telos and..... The phone started ringing.
Looks like my data call is being converted to a voice call somewhere along the route.

Then i remembered i had this problem like this before with a other line provider at an external company we had do dial in to. So i called the phone company (they delivered the lines yesterday) and told them to solve it or we would port the lines back to the old phone company.

Now further on testing with the internal lines. Haven't got that working but the lines are ringing so some detail is wrong because it won't pick up the line. I think i will disable MSN to make things simpler.

Thanks for thinking along.

jochem · 02-26-2008, 08:43 AM

I'm a bit further now, but i need some help (again).

I hooked up 1 telos to each of the internal ISDN lines. When i dial from 1 codec to another (197 to 195) i can see the line ringing. That seems ok to me.
The Telos in extension 195 isn't answering the line automatic, when i set auto answer off i can answer it manualy and everything works fine.

When i make a voice connection from the telos on line 197 to extension 195 the isdn phone starts ringing and the display tels me there is a incomming call from MSN 1

I disabled the MSN for the external lines. I also told the receiving telos that the msn would be 1. Stil no auto answer.

Does anybody have any clue where to look? How to set this up the right way?

OBT · 02-26-2008, 11:25 AM

is the telco a telephone or modem of sort. Can you ring from a standard extension to the ext 195 and answer it with the isdn extension phone. and then try it with the isdn phone on 197. if this works, then the problem is a setting on the telco ( if it is a modem or other data unit)

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