I haven't had much trouble with the 7406e. Sounds like you could have an environmental issue? All wireless technology is prone to transmission issues on site. Have you tried a wireless analog phone on site to see if there's a difference?
We had to install a DMC on one site for the extra antennae because all the walls were brick, and we couldn't get anything else to work well.
I have a T7406 and actually have few problems except for the interference problem. But, I would always choose it over a 7406e because the 7406 blends in with the other equipment better, and plain out, just looks better.
The 7406 IS VERY susceptable to "mutual interferance". This is where a like frequency or harmonic frequency is present and causes various set radio malfunctions. It is also sensitive to almost all other environments where high power transmitters are present. Leads me to suspect no RF shielding and crappy circuits in the phone. One site under a paging tower made all 7406 callers sound like Daffy Duck.
Arr
"..second star to the right and straight on 'till morning.."
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