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times, properly grounding the device, modifying some parameter values on device and changing the cables
solves the problem completely.
Location of your hardware
Interference is another factor for voice quality during voice communication. Often, VoIP equipment
interfere with each other thus producing noise and other problems. For example, if OM20/50 and ATA are
too close to your broadband router or any appliances, you might experience voice quality problems. This is
caused by electrical feedback. Try moving them away from each other to get rid of the garbled calls,
echoes, dropped calls etc.
2.2.3
Static or Dynamic IP address for devices
The OM20/50 becomes a DHCP client of any server on the network. The recommended setting is to use a
static IP address. This configuration provides ease of installation and prevents connectivity issues that would
occur if the IP address of the OM20/50 changed.
When the extension needs to register with the OM20/50 from an external network, New Rock recommends
mapping an external (public) Static IP address or dynamic domain name on the OM20/50.
2.2.4
Fax and POS machine
OM20 supports two fax modes: T.38 and G.711 transparent transmission. It is highly recommended to check
if the facsimile and POS machine can be connected to the FXS port of OM20.When fax messages are
received or sent through an analog trunk, the G.711 transparent transmission mode is required. When fax
messages are received or sent through an IP trunk, a T.38 or a G.711 transparent transmission mode needs to
be selected according to an actual requirement and the mode supported by the IP phone operation platform.
If both T.38 and G.711 transparent transmission modes are supported, T.38 is recommended because it is
more stable.
2.3 Updating the Firmware
It is highly recommended that you check for recent updates before you install your equipment. Later
instructions in this guide will help you to install the firmware that you download in this preparation phase.
To find the latest firmware for a device, go to
