If you have the wrong
handset type your phone will transmit low or not at all!!
Intertel saved a nickel and changed handset types on the
ESP, IMX, GLX, and GMX phones half way through production and kept the old
part numbers on the new phones.
USE WITH ELECTRET HANDSET ONLY!
If the sticker on the phone says this you have to use
an E1 handset!
Some ESP, GLX and GMX DVK phones say this on the bottom tag. That
means they need an electret (or E1) handset. An incorrect handset will
either not transmit or transmit very quiet. The easiest way to tell if you
have an E1 handset is by looking just under the earpiece. You will see a
rectangular notch, if E1 is printed inside the notch you have an electret
handset, if not, it’s a dynamic handset.
Please note that the handset you use could be an after
market handset without the E1 printed in the notch, or your phone could have
been modified at some point in its life. If your phone is transmitting low
or not at all try a new cord and both kinds of handsets.
