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Calls Dropping on PRI--And I'm Caught In the Middle

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PTerrell

Technical User
Jun 23, 2003
125
US
Please help me get out from between a mess of finger pointing so that I can stop our phones from dropping calls!!

My Nortel technician is blaming the telco. The telco is blaming our KSU. The company owner wants the problem to go away. And the accountant doesn't want to pay money to make it happen.

I've got a MICS 6.1 with about 80 phones (of which only about half are in full use). For contract reasons, I've got two PRIs, one from SBC and the other from Mpower. We use the SBC PRI primarily for inbound and the Mpower PRI for outbound.

Over the past month, calls have been dropped or outbound lines were not available. Sometimes this would be system-wide and other it would just hit one phone. Getting exact info from the users (including time, direction, and duration) is always a mixed bag, but the majority reported problems with outbound calls.

The Nortel technician said that he saw framing errors being logged, which indicated that it was a problem with the telco. I repeatedly asked the PRI division of Mpower to test the line – for two weeks, they reported everything was okay. Then they said that one of the telcos that their signal passes across was reporting a problem. A week ago, they reported the problem was fixed. Yet, we still got occasional dropped calls. Their solution—replace the PRI card.

The Nortel technician, who is very conservative and nervous, does not recommend that we replace the PRI card. He believes that the problems will continue after the card is replaced. And that the accountant will blame him for the unnecessary purchase, not pay him, and make us find another technician.

And the company owner can’t understand why I can’t solve the problem!!
 
You need to have a vendor meet.
My money is on SBC. They will never admit the problem is with them.
This way you have both onsite to test.
Gabriel
 
well to make it a cheap fix ...swap the 2 cards you have installed...if problem follows card..walla replace bad card...if problem stays with provider....the provider is the problem.....now if the provider is the problem and now you have proven it to them once they fix it ask "not in a nice way "for a large credit and dont stop asking untill they give it to ya.and make sure your on latest release 6.1 wi 6.10

ski season has started
 
working with the telco to be sure framing and linecoding are correct is important, also be sure all your unused channels are deprovisioned on card . Vendor/Telco meet is a good idea ,Tell them to send their best tech with a T-1 analyzer
 
Thanks all for wading through my story. Despite its length, I did leave out a few details...

Luv2ski,
I had swapped the two PRI cards two Fridays ago at the insistance of the Mpower tech support before he dispatched a telco tech. And the problem seemed to follow the card...one user reported a few dropped inbound calls on one day. No one else reported a problem.

My Nortel guy's logic about why the problem followed the card: SBC and Mpower probably are tied together somewhere down the line, and the errors are coming from that.

But I'm going to show your advice to everyone and get a replacement card ordered. I'll post back with the results.
 
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