IP Dual Port PBXgateway and Remote System Administrator’s Guide
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Test the IP Connection
If all of your Status LEDs indicate the units are installed properly, but you still cannot
connect the remote telephone, you should test the IP connection. This test will not run if
the telephone is off-hook (in an active call).
1. Access the MC.
2. Access the diagnostics menu via Gateway (Remote) ->Utilities->Diagnostics->Test IP
3. Using the default values, select “Begin test.” This test will send voice packets to the
offsite unit and will count the packets as they are sent back.
4. The MC will run the test and, upon its completion, a test results window appears as
shown below.
Figure 41: Test Results Window
5. From a PC on the remote network make sure that you can reliably ping the
PBXgateway.
6. From a PC on the corporate network, make sure you can reliably ping the Remote on
the remote network.
Voice Quality Expectations
The Remote uses an industry-standard voice compression method to allow multiple users
to connect using less bandwidth. While the voice quality should remain excellent in all
circumstances, you may notice some minor issues depending on the voice compression
selected. The person you are talking to on the other end should not notice these affects in
most instances.
The G.729A algorithm only uses 8Kbps for its audio path (plus overhead). It therefore
dramatically reduces the amount of network bandwidth required to extend multiple
telephones. It also provides excellent voice quality to all parties involved in a
conversation. However, this algorithm is designed to optimize audio in the frequency
range of the human voice. Tones outside of that range may sound muffled. Also, listening
to audio that has already been compressed may sound slightly less clear. Here are some
of the affects you may notice with over compressed audio:
1. ‘Hold’ music may sound less clear.
2. Dial tone, DTMF tones, and telephone rings may sound slightly garbled, particularly
on the speakerphone. They still should function properly 100% of the time.
3. May experience some minor echo and reduced audio clarity when calling some cell
phones. They often already compress audio.
4. May hear some echo and notice minor delay in the conversation if calling
internationally. This is caused by the delay in providing compressed audio and the
fact that calling internationally may already introduce some delay.
If you are experiencing any of these problems and feel that it is not presenting you with
adequate voice quality, we recommend using the ADPCM32 or G.711 voice compression
method. While it requires more network bandwidth, it uses less voice compression and
therefore minimizes the chances that any of these effects ever occur.
Document Number: M-4100-MUC
Version: Rev AA
© Copyright 2007 Citel plc All Rights Reserved
