At least on the switches I've seen there is no 8410D+. If your phone is programmed as an 8410D with speakerphone set to 2-way and you have tested it and you are getting sound in and not out I'd say you have a bad microphone.
Check The instrument, I think the instrument itself is bad, Maxg is right because the station programming seems OK for the speaker phone.
Best of Luck..
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.