
114 Chapter 6 Configuring resources — media bay modules
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Figure 27 E1 Parameters
PRI Call-by-Call service selection
The following provides information about how to configure the PRI Call-by-call Service
Selection, which is region-specific to North America, for a DTM set to a PRI Module type.
By default, incoming calls on a PRI are routed based on the Called Party Number information
within the call request. The last number of digits of the called party number which matches the
Received Number Length setting, are used as Receive Digits to find a target line.
For example, assume an incoming called party number is 800-555-1234. The received digit
number length is 4, and the result is 1234. These last four digits are used to route the call.
In North American PRI, the Call-by-Call services allows alternate routing maps to be defined in
various ways, depending on the protocol defined for this PRI.
Use this procedure to define call-by-call services:
1 Click Configuration > Resources > Telephony Resources.
2 Click a PRI bus.
3 Click on Call-by-Call Service Selection.
Table 22 lists the applicable services for the protocol defined on the Module <number> record.
Table 22 Services available for each PRI protocol
Protocol
Services Available
Foreign
Exchg
Inwats (800) Intl-800
Switched
Digital (SDS)
Nine Hundred
(900)
NI-2
SID or All By number or All N/A N/A N/A
DMS100 SID or All SID, By number, or All N/A N/A N/A
DMS250
SID or All SID, By number, or All N/A N/A SID, or By
number, or All
4ESS N/A By number or All By number
or All
By number or All By number or All
SL-1 N/A N/A N/A N/A N/A
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