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Health Care System III
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Advanced Use
Channel Hunting
Below is a list of common ISDN-PRI/T1 switches.
Type Manufacturer PRI Switch Type setting
ATT 4 ESS AT&T AT&T ISDN
ATT 5 ESS AT&T/Lucent AT&T ISDN or National ISDN*
DMS 100 Northern Telecom National ISDN
DMS 250 Northern Telecom National ISDN
* Settings will depend on configuration of the switch. PRI Switch Type is not changed when Restoring Defaults.
Channel hunting is normally used in conjunction with PRI daisy-chaining
with TANDBERG units in the daisy-chain. If only TANDBERG units are
used in the daisy-chain, default setting should be used, as these units will find
available B-channels automatically.
Max Channels may be used for PRIs that are provisioned for a lower number
of channels.
Max Channels may be used as mechanism to ensure that there is bandwidth
available to codecs further down the chain when Daisy-Chaining.
‘High Channel’, ‘Low Channel’ and ‘Search’ may be used for PRIs
provisioned with specific requirements for B-channel usage.
Max Channels Maximum number of channels the unit may use at any given time.
Low Channel The lowest numbered B-channel that may be used by the unit when selecting channels
for outgoing calls.
High Channel The highest numbered B-channel that may be used by the unit when selecting channels
for outgoing calls.
Search Specifies where the system will start searching for available B-channels for outgoing calls.
Codec 1
Low Channel: 10
High Channel: 20
Max Channel: 6
PRI 1
PRI 2
Codec 2
or
PBX
Channels: 1-9
will be available for
the codec/PBX
PRI line
In this example, the unit will start searching for available B-channels at channel 20, because ‘Search’ is set to
‘High’ and ‘High Channel’ is set to 20. The unit will not search for channels below 10, because ‘Low
Channel’ is set to 10. Furthermore if the user tries to make an 8 channel call, the call will be established with
6 channel, because ‘Max Channels’ is set to 6.