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I have seen variants of this on 1416 phones as well, V7 software but suspect it is hardware/firmware in the phone causing this character fragment. Try changing the display setting to show the name and see if it recurs.

FYI, I re-checked the ground on the IP500, added wall rack chassis ground, no reported incidents, but am wary as the problem would not surface for several days in a row.

Cabling is all cat3, no run longer than 150', separated from power cables that are all in metallic conduit. All are using their handset, no headsets involved. The noise burst (I have only heard it once) was loud enough to be heard from the handset easily at a distance of 5 feet. Reminded me of...

I think not, as we are the provider, a small independant telco. I have checked the obvious things, tried to isolate events. Interesting that the other tech from another company that installed a system 6 months ago is having the same problem, different providers. It is very random.

System is grounded, no expansion modules.

Installed my first IP500 5.0.8 more than a month ago in our office. On random incoming calls there is a burst of static for about 1 second as soon as the receiver is lifted, then everything is normal. No pattern to this, might happen 10 times in a day, then nothing the next few days. Happens...

Thanks for this info... ...I am fairly new to ISDN and the IP Office 500 and have been trying to get calls to go out of my PRI to a Nortel DMS-10 (only does NI2), but could not until adding the NI2_CALLED_PARTY_TYPE=UNKNOWN to the Source Numbers in NoUser. I am running 5.0.8 Also, direct line...

It's possible that the provider of the PRI replaced what you were sending because it was outside the block of numbers assigned to your service.