I-2 User’s Reference GuideNote: 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 SPIDsIf your ISDN line is controlled by a DMS-100 switch using National ISDN-1, and your directory numbers are givenas (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 rarelyseen in new installations.Dynamic B-channel usageIf 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 outgoingconnection 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 onthe local ISDN line, and how that line is provisioned (configured). Some types of switch protocols never allowincoming calls when both B-channels are in use. Switch protocols that do allow incoming calls must have theadditional 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.Northern Telecom DMS-100customyyyxxxxxxx1 and yyyxxxxxxx2oryyyxxxxxxx01 and yyyxxxxxxx02National ISDN-1 on AT&T5ESS (multipoint) 01xxxxxxx000National ISDN-1 on NorthernTelecom DMS-100 yyyxxxxxxx0100 and yyyxxxxxxx0101Type of switch: Incoming call allowed?AT&T 5ESS custom N/AAT&T 5ESS National ISDN-1 YesDMS-100 custom Yes*DMS-100 National ISDN-1 Yes*Switch SPID format
