ESI IP 200 Installation Manual page 40

Function 2: CO lines
Function 213: PRI programming
The options under Function 213 are used to program a DLC configured as an ISDN PRI card with 23
B channels and one data channel (the 24th) called the "D" channel. 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 — i.e., 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 calls to the main published number. For example: channels 1–20 can be
occupied by calls to the main published number while channels 21–23 are open or occupied with
DID calls; 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 also are fields for line build-out
(Function 2132), CSU emulation (Function 2133) and DID enable/disable (Function 2135) that
typically are omitted by default.
Function 2131: PRI CO line programming
The 23 voice channels support both inbound and outbound traffic. There must be answer ring
assignments for both daytime and nighttime routing. This routing will be followed only if DID is
enabled. Because the dynamic channel allocation on PRI, there is no control over the channel any
given number rings in on. For this reason, we recommend that you route all channels the same. For
maximum flexibility, the ESI IP Series systems allow each channel to be selectedf individually. For
example: in some case, the outbound line group needs to be different or, perhaps, to have the first
five channels be live-answer and then send the overflow to ID 1.
When performing the CO line programming, remember that there are only 23 channels; because
the 24th is used for signaling, it doesn't take up a port and it needs no programming. If the DLC
(configured for PRI) is in Slot 1, the COs will be 1–23 and the next card will start with CO 24.
1. Using the programmable feature keys, select the line keys to be programmed (use the scroll
keys to select lines 1–23), then press # to confirm.
2. Select Dialtone transmit off/on. Default: Off.
3. Select Playback transmit off/on. Default: Off.
4. Enter the CO name (see "Entering alphanumeric characters," page C.2).
5. Enter the CO line group (9, 8 or 71–76).
6. Make answer ring assignments: Ring 1, Ring 3, Ring 5 and Ring 9. Each ring count can be pro-
grammed for up to 10 extensions, a department, a mailbox or an ID branch.
Note: After you program a ring assignment for a department, mailbox or ID branch, no remain-
ing ring assignments will be required because, upon reaching any of these, the call is
considered answered.
Example: Ring 1
7. Repeat steps 1–6 for night programming.
E.8
Ring 3
X100 X100, X101,
X102
IP Series Installation Manual
Ring 5 Ring 9
ID1 Not used
(system won't
prompt you to
program)