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8.13 Configuring an ISDN Multi-Device Connection With Multiple Subscriber Numbers (for U.S. Only)

Introduction

An ISDN multi-device connection enables users to connect multiple ISDN terminals (such as Internet or ISDN video products) on a single ISDN S0 bus.

An S0 bus from an STLS4 or STMD8 port on the system supports a maximum of eight ISDN terminals; an S0 bus from an optiset E ISDN adapter supports a maximum of two ISDN terminals. The devices share the two 64-Kbps B channels. You must assign each ISDN terminal a multiple subscriber number (MSN) to identify it to the system. ISDN terminals that use 128 Kbps of bandwidth must be assigned two MSNs.

The MSN must be seven digits long. You enter it in the direct inward dialing (DID) field. The ISDN terminal uses the MSN in the DID field as a service profile identifier (SPID) for setting up the communications protocol. You can assign an MSN to any port not associated with a physical station port (Type = No Port), or to the S0 adapter port assigned by the system.

SPIDs associated with the basic rate links can be assigned to any active station device.

For calls to the public network using basic rate trunks, the primary directory number (PDN) for the associated link must be entered in the DID field as the MSN.

During call setup, the ISDN terminal sends the SPIDs to the Hicom 150 E system. The system checks the SPIDs against the MSNs in the DID field, beginning with the rightmost digit.

Call numbers must also be assigned to the ISDN terminals for internal applications. The call numbers must include the rightmost digits of the MSN. For example, if the MSN is 6531600, the internal call number can be 531600, 31600, 1600, or 600. The station numbering scheme in the OfficeCom and the OfficePro systems is from 100 to 749; the station numbering scheme in the OfficePoint system is from 11 to 69.

 
The station numbering scheme in the OfficeCom and the OfficePro systems is from 100 to 749. If one of the MSNs assigned to the customer by the local telephone carrier begins with 100 to 749, a collision with 1611 DID numbers results when the MSN is entered in the DID numbers table. Refer to Section 7.15.2, Multiple Subscriber Number (MSN), on page 7-460 for other dependencies and limitations. 

Example

Using Hicom Assistant E, this example assumes the following conditions:

The customer would like to connect a video conference unit requiring 128 Kbps of bandwidth to an optiset E ISDN adapter.
The system has working BRI links for voice and data calls (CSV and CSD: circuit-switched voice and circuit-switched data).
The SPIDs for the ISDN links are 016531600000 and 016531762001. They have already been entered in the system (refer to Section 8.11).
The primary directory numbers (PDNs) for the links are 6531600 and 6531762.
PDN 6531600 has call appearance ID (CAID) values 1 and 2.
PDN 6531762 has CAID values 3 and 4.
The MSN for PDN 6531600 is 6531600; the call number is 531600.
The MSN for PDN 6531762 is 6531762; the call number is 531762.

Configuring the Feature Using Hicom Assistant E
Step 
Action 
1.  
Options -> Set up station -> Station -> Assign MSN 6531600 to S0 adapter port. 
2.  
Options -> Set up station -> Station -> Assign MSN 6531762 to an unassigned port (Type = No Port). 
3.  
Options -> Set up station -> Station -> Assign call number 531600 to the S0 adapter port used for the MSN. 
4.  
Options -> Set up station -> Station -> Assign call number 531762 to the unassigned port used for the MSN. 
5.  
Options -> Set up station -> Station -> Assign station name to the S0 adapter port, such as "Video Stn 531600." 
6.  
Options -> Set up station -> Station -> Double-click on Parameters field -> BRI -> Assign CAID value 1 to station 531600 
7.  
Options -> Set up station -> Station -> Double-click on Parameters field -> BRI -> Assign CAID value 3 to station 531762 
8.  
Download the changes to the Hicom 150 E system. 
9.  
Reset the Hicom 150 E system. 
10.  
Program the protocol type and SPIDs (MSNs) into the video conference unit. 
11.  
Switch the video conference unit off then on to begin synchronization with the Hicom 150 E system. 
12.  
Place an audio call from the video conference unit to an internal station. 
13.  
Place an audio call from an internal station to the video conference unit by dialing 531600. 
14.  
Place a video call to an external location to test the connection. 

Related Topics

Section 3.3.9, Connecting ISDN Terminals to OfficeCom and OfficePoint, on page 3-111
Section 3.3.9, Connecting ISDN Terminals to OfficeCom and OfficePoint, on page 3-111
Section 7.17.10, Multiple Subscriber Number, on page 7-507
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