Hi y'all-
This one's been vexing me for months.
System: New KXTD-816-7 with one or two KXT-7453, one or two KXT-7431, and a few legacy 7000-series sets. Site is a home with home office, with commercial-grade voice&data cable that was run by our cable specialist.
Problem:
Incoming or outgoing CO call on speakerphone, KXT-7453 or 7431, same problem with each: At some time into the conversation (from 5 minutes to 20 minutes, it varies), the microphone sensitivity of the speakerphone seems to decline, or the gain-switching seems to become less sensitive, such that the person has to speak louder and louder in order to be heard. If the person tries to ignore it and keep speaking louder and louder, there comes a point where they are shouting and not being heard at all, as if the speakerphone has gone deaf.
If the person transfers the call to another -7400 series speakerphone, and continues the conversation on that phone, the problem disappears for a while (5 to 20 minutes) and then recurs during the same conversation. If the person then transfers the call back to the original -7400 series speakerphone, the problem disappears for a while (5 to 20 minutes) and then recurs during the same conversation. There are no problems using the handset.
So, for any given -7400 series speakerphone, it appears to go slowly "deaf" during a conversation, but transferring a call back & forth between speakerphones seems to solve it for a while until they go "deaf," and you can play the transfer round-robin game endlessly with the same results during any given conversation.
We replaced the 816-7 cabinet with another brand new one, and programmed it manually (didn't upload the batch file from the previous cabinet), all programming using the Panasonic DOS tool. Problem continued.
So far what we have is:
It seems to be independent of the telephone set, -7453 or -7431. It appears to be independent of the PBX cabinet, which we replaced.
It's not the station cable, which was run by our cable specialist, who is absolutely meticulous and always gets a 100% pass on all his voice & data cable on the first test. And I'm not just being partial to his work, he really is the best in town.
I have heard of problems associated with CO lines using "pair gain" technology by the local carrier; so I checked that, and the carrier (SBC) says these lines are on clean individual pairs back to the CO.
We infer that there is not an AC mains anomaly, as the client has no problems such as shrinking or flickering images on their computer screen, which would normally occur if there were power line voltage fluctuations or power surges etc. Also the system is on a surge protector.
Has anyone here ever encountered something like this before, and if so, what was causing it, and what was the fix? Or am I dealing with a haunted house?:-)
-George Gleason 510-843-2667 extn 205 [EMAIL PROTECTED] (spammers are terrorists and will be dealt with accordingly)
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