Polycom ViewStation EX Api Manual page 191

ViewStation EX, ViewStation FX, and VS4000 API Guide
Example 2
prichannel set
Example 3
prichannel get 3
User Interface Screen Location
System Info>Admin Setup>Video Network>IMUX>PRI Network>
PRI Status
This screen is only accessible if you have a PRI network interface
connected to your ViewStation FX or VS4000 system.
Important PRI Channel Information
Outgoing Call. For an outgoing call, the ViewStation FX or VS4000
system uses the first active and available channel starting with the
lowest number from the channel range (1-23 for a PRI T1 and 1-30
for a PRI E1). If an additional channel is needed, the system
chooses the next incremental number. For example, if channels 1
through 7 are inactive, but 8 is active and available, then 8 is the first
channel that can be used by the ViewStation ViewStation FX or
VS4000 system to place an outgoing call. If an additional channel is
needed, the system will use the next available active channel in the
range (which could be 9, and so on). Incoming Calls. For incoming
calls, the ViewStation FX or VS4000 system may use the highest
numbered channel in the range and, if needed, proceed to the next
channel number in a decremental order, depending on the type of
third-party equipment attached to the system. For example, an
incoming call arrives on channel 23, then 22, 21, and so on.
Dedicated full PRI T1 or E1 Line: All channels should be active for
a full T1 or E1 line dedicated to your ViewStation FX or VS4000
system.
Fractional PRI T1 or E1: Channel selection should be handled by
your PRI network administrator.
PRI E1 Channel Information. The PRI Status screen (for E1)
shows 30 channels. However, E1 trunk lines have 32 timeslots,
numbered 0 - 31. Timeslot 0 is used for framing, and timeslot 16 is
used for call signaling (the D channel). The remaining 30 timeslots
are used as bearer (data) channels. In call signaling between our
equipment and the switch, these channels are numbered 1-15,
© Polycom, Inc. 2003 183