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Joined: Nov 2007
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For some reason, when we forward extensions to an outside line (via #6011 9 xxx xxx xxxx#), calls to the DID end up with dial tone. This was working fine some time ago--not sure when it "broke".

Internal calls forward out correctly; auto-attendant calls work correctly too.

The only forwarding glitch is DID calls to an extension, forwarding back out. The caller gets dial tone. (I hope that's not DISA...) We have voice T1 circuit, fairly standard setup.

I have some IVP8 boxes which are just routing back out, and those work fine; so I'm suspecting a problem with a trunk, DID, or SCF setting somewhere on the CTX, and probably not a telco provider problem.

Any thoughts on where to start troubleshooting?


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1. The touchtone on that phone might be off. If that phone is giving a problem when forwarding, remove forwarding, swap with another phone and try again.

2. Do the dialing slowly and deliberately. Not saying someone is incompetent, but in desperately looking for answers, maybe someone is dialing fast and the Toshiba is not getting digits slow enough, not likely, but slow and deliberate is better anyway.

3. Put a pause character after the 6011 and after the 9. Might not help but you can see the first time you try it.


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Thanks for the ideas. Those didn't quite work.

1. Happens on multiple phones.
2. Happens on remote call forwarding too.
3. Is the pause * plus a digit indicating seconds? Tried it; same symptom.

However, here's another odd wrinkle. If we dial a forwarded DID from a desk phone, the forwarding works OK; if we dial the DID from a cell phone, it does the dial tone drop.

Now I'm wondering if there's something amok with the upstream telco or the T1 card configuration. Grr!


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Normally these causes would give a busy signal, but off the top of my head.

1. Tandom CO is not enabled in COS
2. When the call is forwarded from an outside number, the Toshiba system push the caller ID of the incoming call as the outgoing caller ID. This can cause some carriers to not allow the call because it is not a DID on their lines.

Is it a PRI or a regular T1?

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It's PRI, on WindStream's VoxIP product. Never had a bit of trouble with it.

We did just relocate, so maybe something in the programming didn't get carried over? We didn't change telco products though--it was a straight relocation. But there was a bit of programming work done by the tech, since we deployed all the DIDs we had been sitting on.

That caller ID thing sounds familiar: I tried to set a few phones to send our 800 line as their caller ID number, and that caused the calls to drop.

Is there a setting to prevent re-sending the caller ID of the inbound call, and just send the normal caller ID instead? I've got eManager program 321 03 Number Verification: Disable, but that's all I can easily find about that.


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I have had something similiar on BRI circuits on a DK280. The number of digits sent from the exchange for ddi calls was changed by the network provider and it only affected forwarded calls. The extra digits caused the setup message to fail. You can use Digtrace on the monitor port of the PRI card to check the data being sent/received.

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I've contacted the telco: they stated that the product we're currently using would not accept any outbound caller ID except billable lines on our account.

So, with the Toshiba pushing the inbound caller ID data back out, the telco rejects the call.

Is there a way to configure the Toshiba to NOT send the inbound caller ID back out?


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UK switches do not forward the incoming CLI by default or it is ignored by the Telco. I would imagine it is an option within system data or PRI set up. You may be able to override this in Prog 322 by adjusting the format. Try it on a single extn and retest I guess?

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Just had the exact issue with VoxIP. Enable number verification in Prog 321 and set the default number to the main phone number. When the call is transfered out the outbound caller ID will show the main number and VoxIP will allow the call to go through.

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Droptop, I think that did it!

321 03 Number Verification is now set "Enable".

It works!

The flyover help says, "Specify whether the number provided should be screened by the PSTN before the call is to proceed."

Many thanks!


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