I-2

User’s Reference Guide

 

 

 

Switch

SPID format

 

 

 

 

 

 

Northern Telecom DMS-100

yyyxxxxxxx1 and yyyxxxxxxx2

 

 

or

 

 

custom

 

 

yyyxxxxxxx01 and yyyxxxxxxx02

 

 

 

 

 

 

 

 

 

National ISDN-1 on AT&T

01xxxxxxx000

 

 

5ESS (multipoint)

 

 

 

 

 

 

 

 

 

National ISDN-1 on Northern

yyyxxxxxxx0100 and yyyxxxxxxx0101

 

 

Telecom DMS-100

 

 

 

 

 

 

 

Note: AT&T 5ESS custom point-to-point switches have no SPIDs and are not represented in the table above. However, this type of switch configuration is supported by the Netopia R3100.

Example SPIDs

If your ISDN line is controlled by a DMS-100 switch using National ISDN-1, and your directory numbers are given as (415)234-5678 and (415)234-5679, your SPIDs are 41523456780101 and 41523456790201. Alternately, your SPIDs can be 41523456780100 and 41523456790200, but these are unusual, and rarely seen in new installations.

Dynamic B-channel usage

If the B-Channel Usage item in a connection profile’s PPP/MP Options screen is set to Dynamic or 2 B, Pre-emptible, one or both B channels may be in use at any time during a call made with that connection profile. Use of the second B-channel depends on traffic volume.

In addition, one of the B-channels may be relinquished if there is an incoming call, or if a second outgoing connection is made using another connection profile.

The ability to allow incoming calls when both B-channels are in use depends on the type of switch protocol on the local ISDN line, and how that line is provisioned (configured). Some types of switch protocols never allow incoming calls when both B-channels are in use. Switch protocols that do allow incoming calls must have the additional call offering (ACO) parameter turned on for data. ACO for data is off by default.

The table below shows which supported switch types can allow an incoming call when ACO for data is on.

Type of switch:

Incoming call allowed?

 

 

AT&T 5ESS custom

N/A

 

 

AT&T 5ESS National ISDN-1

Yes

 

 

DMS-100 custom

Yes*

 

 

DMS-100 National ISDN-1

Yes*

 

 

* Must have two directory numbers assigned.

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Netopia R3100 manual Example SPIDs, Dynamic B-channel usage