Remains a mystery. I found a desk phone by RCA that has been working. Multiple AT&T phones and a Uniden did not work and were returned. Also have an AT&T desk phone without a display that works all the time. POTS voltage measures OK (48V). Problem makes no sense,
Answers:
3 old questions
-You need to mention what model phones and what phone system if any. ATT CL2940, ATT CL2939, Uniden 1360BK
-Did you replace with the same model/make of phones or another? 2 AT$T and 1 Uniden
-Did you try these phones at another location? No
3 New questions:
"Happens...
Calls do not drop. Desk phones operate on batteries (new). Handset will occasionally go dead in the middle of a call. I eliminated handset cord or handset as the problem by trying a different cord & handset with the same behavior. Even if not in a call, simply picking up the handset often gets...
POTS lines from the street. 3 different phones, 2 AT&T and one Panasonic. Simple 1 line desk phones. Always work on speaker, Occasionally will not work on the handset (no sound), other times will work fine. Able to reproduce the problem with the desk phone on the outside connection box...
Home POTS problem. Intermittent problem with desk phones. No sound through handset. Speaker phone always works fine. Happens occasionally. Other times handset works. Only happens on desk speakerphones (ATT & others). Happens on multiple phones. Not the phone set - tried and returned...
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