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TANDBERG Videoconferencing System
77
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