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I-2
User's Reference Guide
Northern Telecom DMS-100
custom
National ISDN-1 on AT&T
5ESS (multipoint)
National ISDN-1 on Northern
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.
* Must have two directory numbers assigned.
Switch
Type of switch:
AT&T 5ESS custom
AT&T 5ESS National ISDN-1
DMS-100 custom
DMS-100 National ISDN-1
SPID format
yyyxxxxxxx1 and yyyxxxxxxx2
or
yyyxxxxxxx01 and yyyxxxxxxx02
01xxxxxxx000
yyyxxxxxxx0100 and yyyxxxxxxx0101
Incoming call allowed?
N/A
Yes
Yes*
Yes*
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Troubleshooting
