Figure 10: Headset Jack Diagram - Grandstream Networks GXV300x Series User Manual

Headset Jack
F 10: H J
IGURE EADSET
The left side of the diagram illustrates the RJ22 (handset plug) pin assignment; the right side illustrates
the 2.5mm headset plug. Additional adaptors are necessary to connect the phone to an external speaker
or intercom/paging system. (Adaptors can be purchased from an local electronics store).
Cross Over Cable For Some Model of Headset
If you want to use headset products with an RJ22 plug, a special cable (known as cross-over cable) or a
cable adapter box is required. The standard handset cable (supplied with the headset) is a roll-over ca-
ble standard for ALL handsets using RJ22 plug.
The default handset plug PIN lay out is China standard (Made in China). US and European customers
cannot use local popular RJ22 headsets without adjusting the connection wiring as follows:
EXAMPLE: C
ONNECTING A
Here are the schemas of the two cables; the plug viewed with Pin side facing user, and PINs layout as
specified above in the diagram:
d: SP +
a: SP -
Grandstream Networks, Inc.
D
ACK IAGRAM
P M12 H
LANTRONICS
c: Mic +
b: Mic -
GXV300x User Manual
EADSET USING CLAMPING TOOLS AND
Firmware 1.2.3.7
RJ22
PLUG
Page 49 of 54
Updated: 12/2010