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Advanced Use TANDBERG Director Videoconferencing System
76
PRI Switch Type
Select the type of PRI switch to which your unit is connected.
Channel Hunting
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.
Below is a list of common ISDN-PRI/T1 switches.
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.
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.
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