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National ISDN Switch Types for Basic Rate and Primary Rate Interfaces introduces changes to ISDN switch types for Primary Rate Interfaces (PRI) and Basic Rate Interfaces (BRI) as follows:
National ISDN Switch Types for Basic Rate and Primary Rate Interfaces provides the following benefits:
Basic Rate Interface (BRI)--An ISDN interface composed of two B channels and one D channel for circuit-switched communication of voice, video, and data.
bearer channel (B Channel)--A channel that carries data on the ISDN interface.
Integrated Services Digital Network (ISDN)--Communication protocols offered by telephone companies that permit telephone networks to carry data, voice, and other source traffic.
non-facility associated signaling (NFAS)--An ISDN service that allows a single D channel to control multiple PRI interfaces. Use of a single D channel to control multiple PRI interfaces can free one B channel on each interface to carry other traffic.
Primary Rate Interface (PRI)--An ISDN interface to primary rate access. Primary rate access consists of a single 64k D channel plus 23 (T1) or 30 (E1) B channels.
signaling channel (D Channel)--A channel used to carry control signals on the ISDN interface.
The following restrictions apply to this feature:
This feature is supported on these platforms:
None
Perform the following tasks to configure an ISDN switch type on an interface level. The first task is required, and the second task is optional.
To configure an ISDN switch type for BRI and PRI interfaces using new switch type keywords, perform the following tasks beginning in global configuration mode. Step 2 is optional.
| Task | Command |
|---|---|
| Step 1 Configure the global ISDN switch type. | isdn-switch type switch-type |
| Step 2 Configure the interface level ISDN switch type (optional). | isdn-switch type switch-type |
You must ensure that the global and interface level ISDN switch types are valid for the ISDN interfaces on the router. Table 1 lists valid ISDN switch types for ISDN BRI and PRI interfaces.
| Keyword | Switch Type |
| ISDN BRI | |
| basic-1tr6 | German 1TR6 ISDN switches |
| basic-5ess | AT&T basic rate switches |
| basic-dms100 | NT DMS-100 basic rate switches |
| basic-net3 | NET3 ISDN, Norway NET3, and New Zealand NET3 switches (covers the Euro-ISDN E-DSS1 signaling system and is ETSI-compliant) |
| basic-ni | National ISDN switches |
| basic-ts013 | Australian TS013 switches |
| ntt | Japanese NTT ISDN switches |
| vn3 | French VN3 and VN4 ISDN BRI switches |
| ISDN PRI | |
| primary-4ess | AT&T 4ESS switch type for the U.S. |
| primary-5ess | AT&T 5ESS switch type for the U.S. |
| primary-dms100 | NT DMS-100 switch type for the U.S. |
| primary-net5 | European, New Zealand and Asia ISDN PRI switches (covers the Euro-ISDN E-DSS1 signaling system and is ETSI-compliant) |
| primary-ni | AT&T National ISDN switch type |
| primary-ntt | Japanese ISDN PRI switches |
| primary-ts014 | Australia PRI switches |
You can configure the router to select the first available B channel in ascending order (channel B1) or descending order (channel B23 for a T1 and channel B30 for an E1). To configure the optional task of selecting B channel order for outgoing calls for PRI interface types, perform the following task in interface configuration mode:
| Task | Command |
|---|---|
| Enable B channel selection for outgoing calls on a PRI interface (optional). | isdn bchan-number-order {ascending | descending} |
Before configuring the ISDN PRI on your router, check with your service vendor to determine if the ISDN trunk call selection is configured for ascending or descending order. If there is a mismatch between the router and switch with regard to channel availability, the switch will send back an error message stating the channel is not available. By default, the router will select outgoing calls in descending order.
This section provides the following ISDN configuration examples:
The following example configures the router to use the isdn switch-type basic-ni global command, which, by default, will be applied to all BRI interfaces:
isdn switch-type basic-ni
!
interface BRI0
The following example configures the router to use the global isdn switch-type basic-net3, and applies isdn switch-type basic-ni to BRI interface 0:
isdn switch-type basic-net3
!
interface bri0
isdn switch-type basic-ni
The following example configures the router to use global isdn switch-type primary-ni and configures the ISDN outgoing call channel selection to be made in ascending order:
isdn switch-type primary-ni
!
interface serial0:23
isdn bchan-number-order ascending
This section documents new and modified commands. All other commands used with this feature are documented in Cisco IOS Release 11.3 configuration guides and command references.
To configure a PRI ISDN interface to make outgoing call selection in ascending or descending order, use the isdn bchan-number interface configuration command. To restore the default (descending order), either use the no form of this command or simply reconfigure the interface with the new value.
isdn bchan-number-order {ascending | descending}| ascending | Makes the outgoing B channel selection in ascending order as follows:
· Channels 1 to 24 for a T1 controller · Channels 1 to 31 for an E1 controller |
| descending | Makes the outgoing B channel selection in descending order as follows:
· Channels 24 to 1 for a T1 controller · Channels 31 to 1 for an E1 controller |
Descending
Interface configuration
This command first appeared in Cisco IOS Release 11.3 T.
This command instructs the router to select the lowest or highest available B channel starting at either channel B1 (ascending) or channel B23 for a T1 and channel B30 for an E1 (descending).
The following example configures the outgoing B channel order on a PRI interface to be in ascending order. The router will select the lowest available B channel beginning with channel B5.
interface serial5:10
isdn bchan-number-order ascending
To add an ISDN switch type to a BRI or PRI interface, use the isdn switch-type interface configuration and global configuration command. To disable the switch on an ISDN interface, use the no form of this command.
isdn switch-type switch-type| switch-type | Central office or ISDN service provider switch type. See Table 1 for valid ISDN switch types for BRI and PRI interfaces. |
Disabled
Interface configuration and global configuration
This command first appeared as an interface configuration command in Cisco IOS Release 11.3 T.
This command first appeared as a global configuration command in Cisco IOS Release 9.1.
The following example shows the global ISDN switch type of basic-ni that is applied to BRI interface 0. The PRI interface (T1 controller), is configured for ISDN switch type primary-net5.
isdn switch-type basic-ni
!
interface BRI0
!
interface serial0:23
isdn switch-type primary-net5
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