IP Server 900 Programming Manual Function 2: CO line programming
E.12
Function 213: PRI programming
The options under Function 213 are used to configure any T1/PRI Module for an ISDN PRI line with
23 B channels and one data channel (24). The first line of the display will indicate the card number and the
type of card. The frame format and line coding will default to the ISDN standard of ESF/B8ZS.
One of the main features of PRI is dynamic channel allocation, meaning all telephone numbers on the PRI
span can come in over any of the 23 channels. This eliminates the need to forecast call volume for the main
published number, because as few as one channel or as many as 23 channels can be occupied at any time by
callers to the main published number. For example, channels 1–20 can be occupied by callers to the main
published number while channels 21–23 are open or occupied with DID callers; later, channels 1–15 can be
occupied by DID callers while channels 16–23 are open or occupied by callers to the main number.
The components required for programming are CO line programming (Function 2131) and Switch protocol
(Function 2134). In addition to the required fields, there are also fields for line build-out (Function 2132), CSU
emulation (Function 2133) and DID enable/disable (Function 2135) that typically are left off at default.
Note: Mailbox 598 is a special-purpose mailbox for monitoring T1/PRI alarms. Whenever the system
detects a severe T1 or PRI alarm, it will store a message in this mailbox. You also can program outdial
notification (in mailbox settings) to alert someone when the system detects such an alarm.
See “Function 7: Reports” (page J.1) for reports on PRI activity.
Function 2131: Line programming
The 23 voice channels support both inbound and outbound traffic. Answer ring assignments must be
assigned for daytime and night routing. This routing will be followed only if DID is disabled. Because of the
dynamic channel allocation on PRI, there is no control over the channel any given number rings in on. For
this reason it is recommended that all channels be routed the same. For maximum flexibility, we allow
each channel to be selected individually. For example: in some cases, the outbound line group needs to
be different or possibly have the first five channels be live-answer, then send the overflow to ID 1.
When performing the CO line programming, remember that there are only 23 channels; the 24th channel
is used for signaling, so it does not take up a port and it needs no programming. If the T1/PRI Module is in
the first position, the COs will be 1–23 and the next T1/PRI Module will start with CO 24.
1. Choose CO lines to program
Using the programmable feature keys, select the line keys to be programmed.
1
Press # to confirm.
2. Select Dialtone transmit on or off.
Default: Off.
3. Select Ringback transmit on or off.
Default: On.
4. Name the CO lines
This is optional; to retain the default values, press #. (See “Optional naming of the CO lines,”
pg. E.4, for more details.)
5. Assign each CO line’s tenant
The tenant parameter
2
is used here to have each CO line follow the day/night mode of the tenant to
which it’s assigned. The day/night mode can be changed either by the day/night programmable feature
key on a station in the same tenant as the CO or by the day/night table assigned for that tenant in
Function 43 (see page G.7).
1
If using an ESI 60, ESI 40, or ESI-30D to program, use the scroll keys to select lines 13–23.
2
To view and change the tenant number, you must first have enabled tenant service in Function 169 (see page D.11).
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