Product manual

FAQs
When I press the ON button on my telephone hybrid unit, the LED light turns on and immediately
goes off.
All of the telephone hybrid units designed by ClearOne require an analog telephone line to drive the telco
circuitry. If the unit does not detect the typical 24 volts to 48 volts from the telco line, the hybrid unit will
not stay on. Verify that the telephone line is connected properly and is a dedicated analog line. The only
exception is if a unit is configured to operate in Dry Line mode.
This problem is isolated to the XAP 400 firmware version 1.0.1 and XAP TH2 firmware versions 1.0.0 and
1.5.0. The current firmware versions, 1.5 for the XAP 400 and 2.5 for the XAP TH2, will correct this issue
by allowing the Line to be activated before the Set is released. Work-arounds include dialing through the
XAP TH2 or XAP 400 instead of the telephone set or disabling the auto-disconnect feature.
Why does my telephone hybrid unit connect with the wrong number even though I dialed the
correct number?
This occurs when the DTMF tones for dialing are very loud and routed to the PA speakers. The loud
DTMF tones are overdriving the echo canceller in the unit, which distorts the tones and results in wrong
number dials. This can be corrected in the XAP TH2 and XAP 400 by bringing down the DTMF level. In
all other telephone hybrid units, it is necessary to lower the PA level or make the call using an analog set
phone connected to the SET jack of the hybrid.