Services and features for ISDN BRI and PRI 863Programming Operations GuideEmergency 911 dialing(North America only)The ISDN PRI feature is capable of transmitting the telephone number and internal extensionnumber of a calling station dialing 911 to the Public Switched Telephone Network (PSTN). Stateand local requirements for support of Emergency 911 dialing service by Customer PremisesEquipment vary. Consult your local telecommunications service provider regarding compliancewith applicable laws and regulations. For most installations the following configuration rulesshould be followed, unless local regulations require a modification.• All PSTN connections must be over PRI.• In order for all sets to be reached from a Public Safety Answering Position (PSAP), the systemmust be configured for DID access to all sets. In order to reduce confusion, the dial digits foreach set should be configured to correspond to the set extension number.• The OLI digits for each set should be identical to the DID dialed digits for the set.• The routing table should route 911 to a PRI line pool.• If attendant notification is required, the routing table must be set up for all 911 calls to use adedicated line which has an appearance on the attendant console.• The actual digit string 911 is not hard-coded into the system. More than one emergencynumber can be supported.If transmission of internal extension numbers is not required or desired, then it is recommendedthat the person in charge of the system maintain a site map or location directory that allowsemergency personnel to rapidly locate a Business Communications Manager set given its DIDnumber. This list should be kept up to date and readily available.IP telephony note: Ensure that you do not apply a 911 route to an IP telephone that is off thepremises where the PSAP is connected to the system.2-way DIDWith PRI the same lines can be used for receiving direct inward dialing (DID) and for makingdirect outward dialing (DOD) calls.The dialing plan configured by your customer service representative determines how calls arerouted. Consult your customer service representative to determine whether or not this feature iscompatible with your service provider.Dialing plan and PRIThe Dialing Plan supports PRI connectivity to public and private networks. The dialing plan is acollection of features responsible for processing and routing incoming and outgoing calls. All PRIcalls must go through a dialing plan.Notes about the dialing plan:• allows incoming calls to be routed to sets based on service type and digits received• provides the ability to map user-dialed digits to a service type on a Call by Call basis
