Thanks for the response. I will try to isolate the problem. Thankfully phone system comes with an internal logging system so when someone reports a bad call I can look it up and find which landline was having that problem. So far I don't have enough data to find a pattern (well, yes first 2 lines are the one with most problems so far but it could be just because they are used the most).
I am going to hook a phone to line 1 directly and bypass the phone system, and have my friend call until I have the problem again. Once I have the problem I will call the technician.
You asked if any other company involved, and the answer is yes. We have another company for toll-free number. i.e. when customer calls
1-800 number our first line rings, if it's busy line 2 rings, if line 2 is busy line 3 rings etc. I mentioned to that AT&T and the customer rep told me those companies have nothing to do with line-quality related problems. Is that true?Deniz
[TELECOM Digest Editor's Note: That is not necessarily true either. The trouble could be with the originating telco equipment or the terminating telco's equipment, although I will grant you since the tragedy known as 'divestiture' and the follow-up tragedy twenty years later (AT&T coming back together again under 'new management' via SBC) originating and terminating telco is probably one and the same, i.e. AT&T, but still, you should not be mentioning _anything_ to a customer service rep which is likely to short out their little one-volt brains. Most 800 number suppliers are usually just wholesale distributors of some distant telcos, and do not handle 'line quality' issues as such. So I guess she was technically correct in saying that. I suggest however that you follow instructions recieved here, and try to isolate the problem to a specific inbound line. PAT]