925VST-TestingTVoIPphones.wpd
Page 2 of 6
jls August 17, 2005
Connecting to a VoIP Phone
The recommended method of connecting a 925VST to a VoIP phone is via the phone's modular "coil-
cord" handset interface. You can use the Sage Instruments Y-modular test access cable, Part No.
2100-0237-01, as illustrated in
Figure 1
.
Note that each leg of the "Y" cable has a different type of modular connector. The thicker one is
terminated in a standard modular RJ11 telephone plug, and labeled "2W" (2-wire). The other is
terminated in a modular RJ22 plug, which is identical to the small modular connector at the end of a
telephone handset coil-cord. This leg is a thinner, flat cable and is labeled "4W" (4-wire).
Procedure:
1. Unplug the existing handset coil-cord cable from the VoIP telephone base unit
2. In its place, plug the "4W" RJ22 end of the "Y" cable
3. Plug the other end of the "Y" cable (a fat, wide RJ45 plug) into the matching jack at the bottom end
of the 925VST
Connecting to a WiFi Phone
The recommended method of
connecting to a WiFi phone is
through its headset jack.
Unfortunately, Sage does not offer a
custom cable for making this
connection, so you will have to
assemble one yourself.
Figure 2
provides sufficient information to
construct an appropriate cable.
Procedure:
1. Plug the RJ45 end of the test
cable into the matching RJ45 jack
at the bottom of the 925VST
2. Plug the mini plug end of the test
cable into the matching jack on
the WiFi phone
925VST
8
1
RJ48/45 Male Plug
(Locking Clip on Bottom)
4-WIRE TX 7
2-WIRE TX, 4-WIRE RX 5
2-WIRE RX, 4-WIRE RX 4
4-WIRE TX 2
8
6
3
1
TO WiFi PHONE MICROPHONE (+)
TO WiFi PHONE EARPHONE (+)
TO WiFi PHONE EARPHONE (-)
TO WiFi PHONE MICROPHONE (-)
WiFi Phone
2260 ohm 1% 1/4 watt "sense"
resistor; required to mute WiFi
Phone internal speaker and
microphone, and inhibit switching to
speakerphone mode
Figure 2
— Connecting the 925VST to a WiFi Phone
