Supplemental Guide – DOC. 8412A
UC-P100-S/UC-P110-S Phones for Skype for Business
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Noisy equipment, such as a PC or a fan, may cause voice interference. Turn off
any noisy equipment.
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Line issues can also cause this problem. Disconnect the old line and redial the call
to check whether another line provides a better connection.
No Sound When the Other Party Answers the Call
If the caller and receiver cannot hear anything - there is no sound when the other party
picks up, the possible reason could be the phone cannot send the real-time transport
protocol (RTP) streams, in which audio data is transmitted, to the connected call.
Try to disable the 180 ring workaround feature. For more information, refer to “180 Ring
Workaround” on page 204.
When Placing a Long-Distance Call Without Plus 0, the Phone Plays the
Local Ringback Tone Instead of Media
Ensure that the 180 Ring Workaround feature is disabled. For more information, refer to
“180 Ring Workaround” on page 204.
Bluetooth Issues
Phone Does Not Always Connect with Bluetooth Device
Delete the registration information of the Bluetooth device on both the phone and the
Bluetooth device, and then pair and connect them again. Contact Crestron or the
Bluetooth device manufacturer for more information.
Bluetooth Headset Affects Voice Quality
Bluetooth voice quality can be affected while the 2.4 GHz band is enabled or when used
in an environment with many other Bluetooth devices. This possible loss in voice quality is
due to the inherent limitations with Bluetooth technology.
Firmware and Upgrading Issues
Phone Does Not Update Firmware Successfully
Do one of the following:
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Ensure the target firmware is not the same as the current firmware.
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Ensure the target firmware is applicable to the phone model.
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Ensure the current or the target firmware is not protected.
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Ensure the power is on and the network is available during upgrade.
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Ensure the web browser is not closed or refreshed when upgrading firmware via
the Web User Interface.