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We are having an issue with our IDCS500 system displaying an error on the phone when dialing an outside line. The display reads, "CO HUNG UP", and it sounds a busy signal. This is not persistent but it is becoming more and more frequent. Does anyone have any suggestions or stories on this type of issue?

Thank you,
Matt

Need more info. What type of trunks are they, pots, PRI, DID, T-1? Does the problem occur only incomming or outgoing calls, or both? Is it always the same trunk number ie: 701, 702, 710 etc.? Typically CO Hung up is a disconnect or loss of signal on the phone company side that the phone system is displaying for you.

I am not really sure how to check some of these things because I am still becoming familiar with working with a phone system. However, all of our phones lines are using the same T1 as our data lines.

Take off the front cover of the iDCS 500 and list the names of the dial tone circuit cards.

They would be TEPRI, TRK C1, TRK B1, etc. From the T-1 jack supplied by AT&T, SBC, Verizon or whoever, does that cable go an Adtran or other routing device with a network cable coming out of it to your phone system or does it go to another box that breaks it into a a thick cable leading to a white block with 50 pins (that would be analog line.)

My best guess is that you are getting insufficent bandwidth because you are not behind a QOS (Quality of Service) router that gives priority to voice packets before data packets.

Most likely your IP person needs to up the bandwidth or give the voice traffic priority over the data traffic.

If you are chewing up too much bandwidth, you are either a very busy sucessful company or you have too many people downloading video from porno sites.

Sorry Bunnie but if it's an integrated T1 which it sounds like what he has bandwidth on the data side would not effect the voice at all. The channels are allocated to each service and one could not effect the other. I have been dealing with a certain CO provider that we recommend and lately all of thier integrated T's have been doing the same sort of thing, random dropped calls. Best guess is that your CO will say it's the phone system, never fails. See if they can come out and swap out the IAD (integrated access device) with a different one or better yet a new one. I've seen CO's put in IAD's (on new service to a customer) that look like they were bouncing around in the guys truck for 2 years. If they won't change the IAD see if they can monitor the voice side of the T1 for problems. You may not have noticed but is the data side going down at all, no internet at times? Start with a phone call to your telco to see what they will do to solve the problem. Hope some of this helps.

Since he didn't know much about how the shared T-1 was getting into the 500 I asked the questions about what trunk cards he had in the system. It could come in via TEPRI or via a channel bank and analog cards.

I think I am guessing as much as you because we don't know how the T is splitting and how the dial tones are being inserted. If Matt would come back and say that the cable from the network jack on the wall goes to Box X and one cable goes to Box Y and then and so forth, we would have a better chance of coming up with a scenario that is more sure than what we have.

I've seen Adtran 624's doing the splitting into bandwidth and pots lines and Adtran 3200's splitting into bandwidth and partial T-1s going into a TEPRI. We both made a guess because there isn't enough information to make a determination as far as I can see.

You know what the word assume breaks down to don't you?