GAI-TRONICS
VoIP Telephone Configuration Guide
Page 67 of 78
If the phone is unable to register or make a call it can fail over to the next account in a
prioritised sequence. The accounts are organised in priority order such that VoIP account 1 is
the highest priority.
There is also a parameter named voip multiple registration mode which sets whether multiple
proxies and registrars are used serially or concurrently. If enabled, the telephone will attempt
to maintain registration with all enabled registrars, and will use the priority sequence for
outbound call failover. If disabled, the phone will attempt to register with the highest priority
registrar available, either if registration fails or when the registration timer expires.
6.
Audio Path Testing (APT)
The telephone can perform acoustic path testing by playing a sound from its earpiece or
speaker and testing whether it can be received correctly by the microphone.
This test verifies that both mic and speaker are functioning.
Testing can be triggered manually or scheduled at regular intervals.
All the controlling parameters are on the Acoustic Path Test web page and the parameter
names all start with “apt_”.
The result of the test is displayed on the Acoustic Path Test web page. If the test fails it is
logged as a fault both on the fault log page and via SNMP trap (see sections 9 & 10).
To initiate a test manually set apt now to “enable” and save. The test will be carried out once
and apt now will return to showing disabled. The parameter “apt enabled” does not need to be
enabled for a manual test.
To schedule periodic testing, set apt enable
to “enable”. Once enabled, the telephone will
perform an acoustic path test starting at “apt time” and repeating every “apt interval” hours
idefinitely. To run a test every 6 hours
starting at 11pm, set apt time to “23:00:00” and apt
interval to 6.
The actual test consists of of tones at a set level and a range of frequencies. The phone
plays the tones from its speaker or earpiece and listens to them through its microphone. It
compares the received audio with the ambient noise when no tone is playing and checks that
the difference lies between 2 thresholds in order to consider the test a pass
The phone can be set to run multiple tests each time, and to consider the whole test a pass if
at least a minimum number of individual tests pass. For example it could be set to run 5 tests
and report a pass if 3 or more out of 5 pass. This feature can be useful in areas where
ambient noise levels vary considerably causing an individual test to fail spuriously. The
number of individual test to run at each instance is “apt count” and the number of those
individual test which need to pass in order to consider the whole to have passed is “apt ok
count”
The default parameters have been found to give optimum results in most cases, on both
handset and handsfree versions of telephone, but the following parameters are available (at
advanced level) if they need to be adjusted for unusual conditions:
•
Apt low threshold - the difference between tone and silence must exceed this to pass.
Units are not defined.
•
Apt high threshold - the difference between tone and silence must be below this to
pass. Units are not defined.
•
Apt frequency
– the centre frequency of tones used. Units are not defined.
•
Apt frequency band
– the bandwidth of frequencies used. Units are not defined.
•
Apt output level
– the level at which test tones are played. Units are not defined.
Various diagnostic information, (some at advanced level), is also shown on the webpage
which can be helpful to diagnose any issues with APT especially in unusual acoustic
environments:
•
Apt status shows the current test status, whether running or stopped.
•
Apt last test date sows the date and time of the last test conducted (based on the
settings on the date/time page).
