-
Cisco IOS Dial Technologies Command Reference, Release 12.2
-
Using Cisco IOS Software
-
Commands A through CAS
-
Commands CHA through CPP
-
Commands D
-
Commands EN through IP
-
Commands IS through L2
-
Commands LCP through MOD
-
Commands MU through PPP
-
Commands PRI through SHE
-
Commands SHOW A through SHOW DI
-
Commands SHOW DS through SHOW LI
-
Commands SHOW M through SHOW N
-
Commands SHOW P through SHOW R
-
Commands SHOW S through SHOW V
-
Commands SHU through X
-
Index
-
Table Of Contents
isdn channel-id invert extended-bit
isdn test disconnect interface
isdn tei-negotiation (interface)
l2tp flow-control backoff-queuesize
l2tp flow-control receive-window
l2tp tunnel retransmit retries
l2tp tunnel retransmit timeout
isdn all-incoming-calls-v120
To configure an ISDN BRI or PRI interface to answer all incoming calls as V.120 when the terminal adapter uses V.120 signalling but does not send the Lower-Layer Compatibility field in Setup messages, use the isdn all-incoming-calls-v120 command in interface configuration mode. To remove this configuration, use the no form of the command.
isdn all-incoming-calls-v120
no isdn all-incoming-calls-v120
Syntax Description
This command has no arguments or keywords.
Defaults
By default, ISDN interfaces answer calls as synchronous serial with PPP encapsulation.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command only when you want all incoming calls to be answered as V.120. If you want the interface to automatically detect whether the incoming call uses V.120 or PPP encapsulation, use the autodetect encapsulation command.
This command applies only when the incoming call originates on an asynchronous device and needs to terminate in an available vty on the router.
Examples
The following partial example shows that BRI 0 is configured to answer all calls as V.120:
interface bri 0isdn all-incoming-calls-v120Related Commands
Enables automatic detection of the encapsulation types in operation over a point-to-point link to a specified serial or ISDN interface.
isdn answer1, isdn answer2
To have the router verify a called-party number or subaddress number in the incoming setup message for ISDN BRI calls, if the number is delivered by the switch, use the isdn answer1 command in interface configuration mode. To remove the verification request, use the no form of this command.
isdn answer1 [called-party-number][:subaddress]
no isdn answer1 [called-party-number][:subaddress]
To have the router verify an additional called-party number or subaddress number in the incoming setup message for ISDN BRI calls, if the number is delivered by the switch, use the isdn answer2 command in interface configuration mode. To remove this second verification request, use the no form of this command.
isdn answer2 [called-party-number][:subaddress]
no isdn answer2 [called-party-number][:subaddress]
Syntax Description
Defaults
The router does not verify the called party or subaddress number.
Command Modes
Interface configuration
Command History
Usage Guidelines
If you do not specify the isdn answer1 or isdn answer2 command, all calls are processed or accepted. If you specify the isdn answer1 or isdn answer2 command, the router must verify the incoming called-party number and the subaddress before processing and/or accepting the call. The verification proceeds from right to left for the called-party number; it also proceeds from right to left for the subaddress number.
You can configure just the called-party number or just the subaddress. In such a case, only that part is verified. To configure a subaddress only, include the colon (:) before the subaddress number.
You can declare a digit a "don't care" digit by configuring it as an x or X. In such a case, any incoming digit is allowed.
Examples
In the following example, 5552222 is the called-party number and 1234 is the subaddress:
interface bri 0isdn answer1 5552222:1234In the following example, only the subaddress is configured:
interface bri 0isdn answer1 :1234isdn autodetect
To enable the automatic detection of ISDN SPIDs and switch type, use the isdn autodetect command in interface configuration mode. To disable the automatic detection of ISDN SPIDs and switch type, use the no form of this command.
isdn autodetect
no isdn autodetect
Syntax Description
This command has no arguments or keywords.
Defaults
The automatic detection of ISDN SPIDs and switch type is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command applies to North America only. If you are outside of North America, you must use the isdn switch-type switch-type interface configuration command to specify the ISDN switch type.
Examples
The following example enables the automatic detection of ISDN SPIDs and switch type:
isdn autodetectRelated Commands
Defines the SPID number that has been assigned by the ISDN service provider for the B1 channel.
Specifies the central office switch type on the ISDN BRI or PRI interface.
isdn bchan-number-order
To configure an ISDN PRI interface to make outgoing call selection in ascending or descending order, use the isdn bchan-number-order command in interface configuration mode. To restore the default (descending order), use the no form of this command or simply reconfigure the interface with the new value.
isdn bchan-number-order {ascending | descending}
no isdn bchan-number-order
Syntax Description
Defaults
Descending
Command Modes
Interface configuration
Command History
Usage Guidelines
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).
This command is for PRI configuration only.
Examples
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 B1.
interface serial5:10 isdn bchan-number-order ascendingisdn busy
To set a false busy signal on an ISDN B channel, use the isdn busy command in interface configuration mode. To remove this condition, use the no form of this command.
isdn busy dsl number b_channel number
no isdn busy dsl number b_channel number
Syntax Description
Defaults
Disabled
Command Modes
Interface configuration
Command History
Usage Guidelines
This command gives the impression that a call is active when the channel is actually idle.
Use the b_channel 0 keywords to set a false busy signal on the entire interface.
Use the show isdn command with the status keyword to display the DSL number and channel state.
Examples
The following example sets the entire PRI interface to a false busy signal; the DSL number was obtained using the show isdn command with the status keyword, and then used in the command.
isdn busy dsl 3 b_channel 0 state 1The following example sets the false busy signal on B channel 11; the DSL number was obtained using the show isdn command with the status keyword, and then used in the command.
isdn busy dsl 3 b_channel 11 state 2Related Commands
Takes an individual B channel or an entire PRI interface out of service or sets it to a different channel service state that is passed in to the switch.
isdn call interface
To make an ISDN data call, use the isdn call interface command in privileged EXEC mode.
isdn call interface interface-number dialing-string [speed 56 | 64]
Syntax Description
interface-number
Interface number.
dialing-string
Telephone number used for making ISDN data call.
speed 56
speed 64
(Optional) Line speed (56 or 64 kbps) used for making ISDN data call.
Defaults
The default B-channel speed is 64 kbps.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can use the isdn call interface command to test your DDR configuration. You can also use this command to verify the dialing string and speed without having to know the IP address of the remote router or without configuring a dialer map or string.
The isdn call interface command is being replaced by the isdn test call interface command in Cisco IOS Release 12.2.
Examples
The following example makes an ISDN data call through interface bri 0 to 555-1111 and at a line speed of 56 kbps:
isdn call interface bri 0 5551111 speed 56Related Commands
isdn caller
To configure ISDN caller ID screening and optionally to enable ISDN caller ID callback for legacy dial-on-demand routing (DDR), use the isdn caller command in interface configuration mode. To disable this feature, use the no form of this command.
isdn caller phone-number [callback] [exact]
no isdn caller phone-number [callback] [exact]
Syntax Description
Defaults
Disabled
Command Modes
Interface configuration
Command History
10.0
This command was introduced.
11.2 F
This command was implemented on additional Cisco router and access server platforms.
12.1
The exact keyword was added.
Usage Guidelines
This command configures the router to accept calls from the specified number.
Note
Caller ID screening requires a local switch or router that is capable of delivering the caller ID to the router. If you enable caller ID screening but do not have such a switch or router, no calls are allowed in. Caller ID screening is available on Cisco 7200 and 7500 series, Cisco 4000 series, Cisco 3000 series, and Cisco 2500 series routers that have one or more BRIs.
When the optional callback keyword is used and a call is received from one of the callback numbers, the initial call is rejected (hence, not subject to tolls) and a callback is initiated to that calling number.
When Xs are used in the callback number, dialer caller screening is based on a best match system that uses the number of Xs as a criterion. To make callback calls only to specified numbers or ranges of numbers but to accept any other incoming calls, make sure that the number of Xs in any configuration line that uses the callback keyword is less than the number of Xs in any configuration line that does not use the keyword.
For example, if you use at most four Xs in the configuration lines with the callback keyword, then to accept calls from other numbers use at least five Xs in a configuration line that does not use the keyword.
When a telephone number is entered without the exact keyword, the software compares each number going from right to left until matching numbers are detected. For example, if the phone-number argument is 4085551234, calls from telephone numbers 1234, 51234, 5551234, and 4085551234 would be accepted, but calls from telephone numbers 44 and 4155551234 would be rejected.
If you want to accept a telephone number exactly as it is configured, enter it with the exact keyword. For example, if the phone-number argument is 5551212 and the exact keyword is applied, only the telephone number 5551212 is accepted; calls from telephone numbers 408551212 and 51212 would be rejected.
The maximum length of each telephone number is 25 characters. There is no limit on the numbers you can specify per interface.
Examples
The following example configures the router to accept a call containing the numbers 415 555-1234:
isdn caller 4155551234The following example configures the router to accept a call only from telephone number 555-1234:
isdn caller 5551234 exactIn the above example, a call from telephone number 415 555-1234 would be rejected.
The following example configures the router to accept a call with telephone number containing 415 555-12 and any numbers in the last two positions:
isdn caller 41555512xxIn the following example, callback calls will be made only to numbers in the 555 and 556 exchanges, but any other telephone number can call in:
isdn caller 408555xxxx callbackisdn caller 408556xxxx callbackisdn caller xxxxxRelated Commands
isdn calling-number
To configure an ISDN PRI or BRI interface to present the number of the device making the outgoing call, use the isdn calling-number command in interface configuration mode. To remove a previously configured calling number, use the no form of this command.
isdn calling-number calling-number
no isdn calling-number
Syntax Description
Defaults
No calling number is presented.
Command Modes
Interface configuration
Command History
Usage Guidelines
An interface can have only one ISDN calling-number entry.
For ISDN BRI, this command is intended for use when the ISDN network offers TS014 tariffing, in which devices present the calling (billing) number.
For ISDN PRI, this command is intended for use when the network offers better pricing on calls in which devices present the calling number (that is, the billing number). The calling number information is included in the outgoing setup message.
Note
Examples
The following example first configures the T1 interface, then configures the D channel interface to present the billing number 4233570925 when it makes outgoing calls:
controller t1 1/1framing esflinecode b8zspri-group timeslots 1-23isdn switchtype primary-4ess!interface serial 1/1:23ip address 10.1.1.1 255.255.255.0encapsulation pppisdn calling-number 4233570925dialer map ip 10.1.1.2 name dallas 14193460913In the following example, the ISDN BRI interface is configured to present the number 5551212 when it makes outgoing calls:
interface bri 0isdn calling-number 5551212Related Commands
isdn calling-pty
To specify whether the network-provided or user-provided calling party number is selected when two calling party numbers are sent from a primary NET5 switch on ISDN, use the isdn calling-pty command in interface configuration mode. To reset the default value, use the no form of this command.
isdn calling-pty {network-provided | user-provided}
no isdn calling-pty
Syntax Description
network-provided
Network-provided calling party number.
user-provided
User-provided calling party number.
Defaults
User-provided calling party number
Command Modes
Interface configuration
Command History
Usage Guidelines
The isdn calling-pty command is useful for customers that use network-provided and user-provided calling party numbers for accounting purposes. The selected number will be used by dialer filters such as that configured with the isdn caller command.
Examples
The following example configures the ISDN switch to accept network-provided calling party numbers:
interface Serial0:23no ip addressencapsulation pppdialer rotary-group 1isdn switch-type primary-net5isdn protocol-emulate networkisdn incoming-voice modemisdn calling-number 1111111isdn calling-pty network-providedisdn T310 40000no cdp enableRelated Commands
isdn channel-id invert extended-bit
To invert the value of the extend bit (0x80) in the last octet of the channel ID information element, use the isdn channel-id invert extended-bit command in interface configuration mode. To restore the default setting, use the no form of this command.
isdn channel-id invert extended-bit
no isdn channel-id invert extended-bit
Syntax Description
This command has no arguments or keywords.
Defaults
The last octet of the channel ID information element is not inverted.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command if you use a primary-DMS 100 switch type to ensure compatibility with a Setup or Call Proceeding message containing a channel ID information element. This command can be used only with ISDN PRI.
This command replaces the isdn-flip-chan-flag command.
Examples
The following example configures the router to invert the extended bit in the last octet of the channel ID information element:
isdn channel-id invert extended-bitisdn conference-code
To activate three-way call conferencing, use the isdn conference-code command in interface configuration mode. To disable three-way call conferencing, use the no form of this command.
isdn conference-code range
no isdn conference-code
Syntax Description
Defaults
The default code is 60.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command if your ISDN line is connected to an NI1 or a Nortel DMS-100 Custom switch. Your telephone service provider should provide an ISDN conference code when you order three-way call conferencing.
Examples
The following example specifies 61 as the ISDN conference code:
isdn conference-code 61isdn disconnect-cause
To send a specific ISDN cause code to the switch, use the isdn disconnect-cause command in interface configuration mode. To return to the default condition, use the no form of this command.
isdn disconnect-cause {cause-code-number | busy | not-available}
no isdn disconnect-cause
Syntax Description
Defaults
The default condition is no cause code override. If the isdn disconnect-cause command is not configured, the default cause codes for the application are sent.
Command Modes
Interface configuration
Command History
Usage Guidelines
The isdn disconnect-cause command overrides specific cause codes (such as modem availability and resource pooling) that are sent to the switch by ISDN applications. When the isdn disconnect-cause command is implemented, the configured cause codes are sent to the switch; otherwise, the default cause codes for the application are sent. ISDN protocol errors are still reflected in the cause codes and are not overridden.
Examples
The following example sends the CHANNEL-NOT-AVAILABLE code to the ISDN switch:
interface serial0:20 isdn disconnect-cause not-availableRelated Commands
isdn disconnect interface
To disconnect an ISDN data call without bringing down the interface, use the isdn disconnect interface command in privileged EXEC mode.
isdn disconnect interface interface-type interface-number {b1 | b2 | all}
Syntax Description
interface-type interface-number
Interface type and number, such as bri 0.
b1
B channel 1.
b2
B channel 2.
all
B channels 1 and 2.
Defaults
A default interface is not defined.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
You can use the isdn disconnect interface command to disconnect any ongoing data calls placed manually or caused by DDR.
The isdn disconnect interface command is being replaced by the isdn test disconnect interface command in Cisco IOS Release 12.2.
Examples
The following example disconnects an ISDN data call through interface bri 0 and B channel 1:
isdn disconnect interface bri 0 b1Related Commands
isdn fast-rollover-delay
To control the timing between successive dial attempts, use the isdn fast-rollover-delay command in interface configuration mode. To remove or change a value, use the no form of this command.
isdn fast-rollover-delay seconds
no isdn fast-rollover-delay
Syntax Description
Defaults
No default timer.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command provides a timer separate from the dialer wait-for-carrier timer to control the amount of time that elapses before calls are redialed. This delay is provided to allow the old call to be torn down completely before the new call is attempted.
The isdn fast-rollover-delay command is necessary on some ISDN switches because the new call may be attempted before the old call is completely torn down, which causes the second call or the callback to fail.
Use this command when all the following conditions are true:
•
•
•
•
When these conditions occur, set the isdn fast-rollover-delay command to 5 seconds and try again. A delay of 5 seconds should cover most cases. Configure sufficient delay to make sure that the ISDN RELEASE_COMPLETE message has been sent or received before the fast rollover call is made. Use the debug isdn q931 command to display this information.
When the isdn fast-rollover-delay command is configured on a client requesting callback, the callback client first confirms whether the callback server has placed a call back to the callback client before dialing any subsequent numbers.
Examples
The following partial example sets the fast-rollover delay that is suggested when all the conditions specified in the list in the "Usage Guidelines" are true:
isdn fast-rollover-delay 5Related Commands
isdn flip-chan-flag
The isdn flip-chan-flag command is replaced by the isdn channel-id invert extended-bit command. See the description of the isdn channel-id invert extended-bit command for more information.
isdn guard-timer
To enable a managed timer for authentication requests, use the isdn guard-timer command in interface configuration mode. To reset the timer to its default value, use the no form of this command.
isdn guard-timer msecs [on-expiry {accept | reject}]
no isdn guard-timer
Syntax Description
Defaults
The default timer value is eight (8) seconds and calls are rejected when the timer expires.
Command Modes
Interface configuration
Command History
Usage Guidelines
The guard-timer starts when the DNIS number is sent to AAA for authentication. When the timer expires, authentication ends and the call is accepted or rejected based on the configured expiry action.
Examples
The following example sets the guard-timer to six (6) seconds and specifies that the call should be rejected if AAA does not respond within that interval:
interface serial 1/0/0:23isdn guard-timer 6000 on-expiry rejectRelated Commands
isdn incoming-voice
To route all incoming voice calls to the modem and determine how they will be treated, use the isdn incoming-voice command in interface configuration mode. To disable the setting or return to the default, use the no form of this command.
isdn incoming-voice {voice | data [56 | 64] | modem [56 | 64]}
no isdn incoming-voice {voice | data [56 | 64] | modem [56 | 64]}
Syntax Description
Defaults
data 64
Command Modes
Interface configuration
Command History
Usage Guidelines
Unless you specify otherwise, all calls received by the router and characterized as voice calls are treated as normal ISDN calls, which are handled as digital data and not passed over to the modem. Ordinarily, a data device ignores incoming voice calls, but the tariff structure for data and voice calls might make it less expensive to do "data over voice" calls.
If you use the voice keyword, incoming ISDN voice calls will be treated as voice calls and handled by either a modem or a voice DSP as directed by CSM.
If the default value is configured and the bearer capability of the incoming call is the voice keyword, the call will be rejected.
To answer incoming voice calls at a configured rate (overriding the incoming data rate in the call), use the data keyword.
To establish speedier connections for analog calls to the router, use the isdn incoming-voice command with the modem keyword to have voice calls routed through digital modems (as pulse-code modulated analog data) instead of being treated as digital data.
Configure this command on each D channel in the access server or router. Incoming circuit-switched data calls are not affected by this command.
Note
Examples
The following example designates incoming ISDN voice calls to be treated as voice calls:
interface 10isdn incoming-voice voiceThe following example for channelized T1 configures the D channel (hence, all B channels) to answer all incoming voice calls at 56 kbps:
interface serial 0:23isdn incoming-voice data 56The following example routes all incoming voice calls through the modem as analog data:
interface BRI 0/0isdn incoming-voice modemThe following example enables incoming and outgoing ISDN calls to route to the modems using the D channel serial interface:
interface serial 0:23isdn incoming-voice modemisdn layer1-emulate
To configure the Layer 1 operation of a BRI voice port as clock master (NT) or slave (TE), use the isdn layer1-emulate command in interface configuration mode. To restore the default (user), use the no form of this command.
isdn layer1-emulate {user | network}
no isdn layer1-emulate
Syntax Description
user
Physical interface operation in clock slave mode (as TE).
network
Physical interface operation in clock master mode (as NT).
Defaults
Layer 1 port operation is as user (TE functionality as clock slave).
Command Modes
Interface configuration
Command History
12.0(3)XG
This command was introduced on the MC3810.
12.1(3)XI
This command was implemented on the Cisco 2600 and Cisco 3600 series.
Usage Guidelines
If you use the no isdn layer1-emulate network command, the physical layer port operation defaults to user.
Examples
The following example configures the Layer 1 operation of a BRI voice port as QSIG clock slave (TE):
configure terminalinterface bri 1isdn layer1-emulate userRelated Commands
isdn leased-line bri
To configure an ISDN BRI for leased-line service at 128 kbps, use the isdn leased-line bri command in global configuration mode. To remove the configuration, use the no form of this command.
isdn leased-line bri number [128]
no isdn leased-line bri number [128]
Syntax Description
number
BRI interface number.
128
(Optional) Aggregates two B channels into a single pipe at a speed of 128 kbps.
Defaults
Disabled
Command Modes
Global configuration
Command History
Usage Guidelines
Use this command to aggregate two B channels into a single pipe at a speed of 128 kbps. This service is available only for ISDN BRI.
When you use an ISDN BRI interface for access over leased lines, configure the ISDN BRI as a synchronous serial interface. Do not configure ISDN calling and called numbers.
Examples
The following example configures the BRI 0 interface for leased-line access at 128 kbps in Japan.
isdn leased-line bri 0 128Because of the leased-line—not dialed—environment, configuration of ISDN called and calling numbers is not needed and not used. The BRI 0 interface is henceforth treated as a synchronous serial interface, with the default HDLC encapsulation.
The following example configures the BRI 0 interface for PPP encapsulation:
interface bri 0ip address 10.1.1.2 255.255.255.0encapsulation pppbandwidth 128Related Commands
isdn map
To override the default ISDN type and plan generated by the router with custom values, use the isdn map command in interface configuration mode. To revert to the default ISDN type and plan, use the no form of this command.
isdn map {address address | regexp | plan plan | type type}
no isdn map {address address | regexp | plan plan | type type}
Syntax Description
address address
Address map, which can be to either the calling or called number.
regexp
Regular expression for pattern matching.
plan plan
ISDN numbering plan.
type type
ISDN number type.
Defaults
The default is the ISDN type and plan generated by the router.
Command Modes
Interface configuration
Command History
Usage Guidelines
This function can be configured on a per-number basis or on numbers that match regular expression patterns. Keywords and arguments for any or all of the possible parameters can be included.
Examples
The following example overrides any plan and type used for any ISDN calls with a called or calling number exactly matching 123:
int serial1:23isdn map address 123 plan isdn type unknownThe following example overrides any plan and type used for ISDN calls with a called or calling number that begins with the numerals 12:
int serial1:23isdn map address 12.* plan data type subscriberThe following example matches any number ending with the number 7:
int serial1:23isdn map address .*7 plan data type subscriberisdn modem-busy-cause
The isdn modem-busy-cause command is replaced by the isdn disconnect-cause command. See the isdn disconnect-cause command for more information.
isdn negotiate-bchan
To enable the router to accept a B channel that is different from the B channel requested in the outgoing call setup message, use the isdn negotiate-bchan command in interface configuration mode. To restore the default condition, use the no form of this command.
isdn negotiate-bchan [resend-setup]
no isdn negotiate-bchan [resend-setup]
Syntax Description
resend-setup
(Optional) Supports NET5 and NI2 PRI switches only. Specifies that if the requested B channel is not available, the router resends a setup message requesting a different B channel.
Defaults
B-channel negotiation is not enabled. Most PRI switch types set the default channel ID to Exclusive in the setup message. An exception is the NI2 switch which sets the default to Preferred.
This command is the default for thunder dial and thunder voice configurations (Cisco SS7 Interconnect for voice and dial).
Command Modes
Interface configuration
Command History
11.3
This command was introduced.
12.2
The resend-setup keyword was added for NET5 and NI2 ISDN switches.
Usage Guidelines
The isdn negotiate-bchan command enables the router to negotiate the B channel by setting the channel ID information element to Preferred in the setup message. If this command is not configured, the channel ID is set to the default of the switch, which is usually Exclusive. Exclusive means that only the requested B channel is accepted; if the requested B channel is not available, the call is cleared.
The isdn negotiate-bchan command is supported for all PRI switch types. The resend-setup keyword is supported only for NET5 and NI2 switches. This command is not supported for BRI interfaces.
This command is automatically created when the isdn rlm-group is configured under D channel.
Examples
The following example enables an alternate B channel for serial interface 0:23:
interface serial0:23isdn negotiate-bchanRelated Commands
Configures an ISDN PRI interface to make outgoing call selection in ascending or descending order.
Specifies the central office switch type on the ISDN PRI interface.
isdn not-end-to-end
To override the speed that the network reports it will use to deliver the call data, use the isdn not-end-to-end command in interface configuration mode. To disable the configured end-to-end speed, use the no form of this command.
isdn not-end-to-end {56 | 64}
no isdn not-end-to-end
Syntax Description
Defaults
The default line speed is 64 kbps.
