No dialer command under ISDN BRI interface

Hi all,
I have a 2901 router voice bundle with 4 ISDN BRI ports and would like to have them bundled under Dialer1 interface. Unfortunately it doesn't give me option for Dialer command under BRI interface as expected.
router(config-if)#int bri0/0/0
router(config-if)#dia
router(config-if)#dia
^
% Invalid input detected at '^' marker.
router(config-if)#dialer
^
% Invalid input detected at '^' marker.
router(config-if)#
I assume it's down to the UC license installed on the device but not sure. Does the ISDN BRI interface behave in different way under this license?
Pasting portion of "show ver" as well.
Cisco CISCO2901/K9 (revision 1.0) with 479232K/45056K bytes of memory.
Processor board ID
2 Gigabit Ethernet interfaces
4 ISDN Basic Rate interfaces
1 terminal line
DRAM configuration is 64 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
250880K bytes of ATA System CompactFlash 0 (Read/Write)
License Info:
License UDI:
Device# PID SN
*0 CISCO2901/K9
Technology Package License Information for Module:'c2900'
Technology Technology-package Technology-package
Current Type Next reboot
ipbase ipbasek9 Permanent ipbasek9
security None None None
uc uck9 Permanent uck9
data None None None
Configuration register is 0x2102

Hi,
Snippet of "sh ver" with IOS version is below:
router#show ver
Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.2(4)M5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Fri 13-Sep-13 14:59 by prod_rel_team
ROM: System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)
router uptime is 2 days, 21 hours, 47 minutes
System returned to ROM by reload at 16:48:03 UTC Mon Aug 18 2014
System restarted at 16:50:01 UTC Mon Aug 18 2014
System image file is "flash0:c2900-universalk9-mz.SPA.152-4.M5.bin"
Last reload type: Normal Reload
Last reload reason: Reload Command
The output of trying to type dialer command is in the initial post, I'm also pasting all available commands under bri0/0/0.
router(config-if)#int bri0/0/0
router(config-if)#?
Interface configuration commands:
aaa Authentication, Authorization and Accounting.
access-expression Build a bridge boolean access expression
arp Set arp type (arpa, probe, snap), timeout, log
options or packet priority
authentication Auth Manager Interface Configuration Commands
autodetect Autodetect Encapsulations on Serial interface
bandwidth Set bandwidth informational parameter
bgp-policy Apply policy propagated by bgp community string
bridge-group Transparent bridging interface parameters
carrier-delay Specify delay for interface transitions
cdp CDP interface subcommands
clns CLNS interface subcommands
clock Configure serial interface clock
cwmp Configure CPE WAN Management Protocol(CWMP) on this
interface
dampening Enable event dampening
default Set a command to its defaults
delay Specify interface throughput delay
description Interface specific description
dot1q dot1q interface configuration commands
dot1x Interface Config Commands for IEEE 802.1X
down-when-looped Force looped serial interface down
encapsulation Set encapsulation type for an interface
ethernet Ethernet interface parameters
exit Exit from interface configuration mode
flow-sampler Attach flow sampler to the interface
full-duplex Configure full-duplex operational mode
h323-gateway Configure H323 Gateway
half-duplex Configure half-duplex and related commands
help Description of the interactive help system
history Interface history histograms - 60 second, 60 minute
and 72 hour
hold-queue Set hold queue depth
ip Interface Internet Protocol config commands
iphc-profile Configure IPHC profile
ipv6 IPv6 interface subcommands
isdn ISDN Interface configuration commands
isis IS-IS commands
iso-igrp ISO-IGRP interface subcommands
keepalive Enable keepalive
line-power Provide power on the line.
llc2 LLC2 Interface Subcommands
load-interval Specify interval for load calculation for an
interface
logging Configure logging for interface
loopback Configure internal loopback on an interface
mab MAC Authentication Bypass Interface Config Commands
mac-address Manually set interface MAC address
macro Command macro
metadata Metadata Application
mop DEC MOP server commands
mtu Set the interface Maximum Transmission Unit (MTU)
netbios Use a defined NETBIOS access list or enable
name-caching
network-clock-priority Configure clock source priority
no Negate a command or set its defaults
ntp Configure NTP
ospfv3 OSPFv3 interface commands
pulse-time Force DTR low during resets
rate-limit Rate Limit
redundancy RG redundancy interface config
routing Per-interface routing configuration
sdllc Configure SDLC to LLC2 translation
serial serial interface commands
service-policy Configure CPL Service Policy
shutdown Shutdown the selected interface
smds Modify SMDS parameters
snapshot Configure snapshot support on the interface
snmp Modify SNMP interface parameters
source Get config from another source
tarp TARP interface subcommands
timeout Define timeout values for this interface
topology Configure routing topology on the interface
transmit-interface Assign a transmit interface to a receive-only
interface
trunk-group Configure interface to be in a trunk group
tx-ring-limit Configure PA level transmit ring limit
vpdn Virtual Private Dialup Network
vrf VPN Routing/Forwarding parameters on the interface
waas WAN Optimization
router(config-if)#

Similar Messages

ISDN BRI INTERFACE

Isdn bri interface is used as backup by serial interface
backup delay 10 60
under bri interface following command is also configured
dialer idle-timeout 900
what will be idle timeout of bri interface if serial interface comes back and functional.

Hello Jabbar,
this looks like a cisco BCRAN question, here it goes:
the backup delay 10 60 , means that it will take 10 seconds before the secondary link comes up, after the primary goes down, and it will take 60 seconds after the primary goes back up, before the secondary goes down.
dialer idle-timeout 900:
this command indicates how long the call can stay idle before it is disconnected.
from cisco:
"This command is used on lines for which there is no contention. When contention occurs, the dialer fast-idle command is activated. For example, when a busy line is requested to send another packet to a different destination than it is currently connected to, line contention occurs and the dialer fast-idle command is activated.
By default, this command applies to inbound and outbound calls. For example, if a receiving system needs to make outgoing calls, you might configure it with a short idle timeout.
Only packets that match the dialer group reset the idle timer."
So, I guess it would be 900s
HTH,
please rate this post if it does,
Vlad

IDLE-TIMEOUT IN ISDN BRI INTERFACE

If bri isdn interface is backup by serial interface. Two commands are president for timeout bri interface
one under backup serial interface
1. backup delay 10 30
The other under bri interface
2. dialer idle-timeout 800
My query is when interface serial comes back what will be time bri interface to in the disconnect position 30 or 800.

hi
AFAIK ideally the time would be 830 (30+800) coz the traffic will only get diverted back to serial interface after its observed stable for the configured time period which is 30 here.
Once it starts getting the traffic thru main serial interface the dialer interface will become idle..
so it will have to stay upto the timeout period (800 here)configured to get disconnected..
regds

Isdn bri interfaces

If I had 2 isdn routers on different sites and wanted them to connect, do I need to put both BRI interfaces on the same subnet or does it not matter with isdn ?

Hi
AFAIK there are 2 ways one is considering the isdn connectvitiy as a seperate point to point link and assigining a seperate /30 block for that connectivity or else you can also use ip unnunmbered option and make use of your ethernet ip or the loopback ip.
But i would suggest to go with the first option coz of the simplicity involved, also the second option may create or result in some operational problems if you have some routing protocol in place between your locations.
regds

MGCP Gateway With ISDN BRI interface

Hi Guys,
I have a voice gateway with a BRI card on slot 0/3/0 (port 0/1) and I wanted to terminate both WAN and PSNT connection to the same gateway with MGCP protocol, and as I'm new to voice over IP world can anyone suggest/recommand me a proper guide which includes the stepts and proper explanations to acheive this task.
Thank you
Regards,
Suthakar

Hi Aman,
As discussed please find the attached output as follows,
#sh isdn status
Global ISDN Switchtype = basic-net3
%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply
ISDN BRI0/0/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003
    Layer 1 Status:
DEACTIVATED
    Layer 2 Status:
Layer 2 NOT Activated
    Layer 3 Status:
0 Active Layer 3 Call(s)
    Active dsl 0 CCBs = 0
    The Free Channel Mask: 0x80000003
%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 1. Layer 3 output may not apply
ISDN BRI0/0/1 interface
dsl 1, interface ISDN Switchtype = basic-net3
L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003
    Layer 1 Status:
DEACTIVATED
    Layer 2 Status:
Layer 2 NOT Activated
    Layer 3 Status:
0 Active Layer 3 Call(s)
    Active dsl 1 CCBs = 0
    The Free Channel Mask: 0x80000003
ISDN BRI0/3/0 interface
dsl 12, interface ISDN Switchtype = basic-net3
    Layer 1 Status:
ACTIVE
    Layer 2 Status:
Layer 2 NOT Activated
    Layer 3 Status:
0 Active Layer 3 Call(s)
    Active dsl 12 CCBs = 0
    The Free Channel Mask: 0x80000003
%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 13. Layer 3 output may not apply
ISDN BRI0/3/1 interface
dsl 13, interface ISDN Switchtype = basic-net3
L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003
    Layer 1 Status:
ACTIVE
    Layer 2 Status:
Layer 2 NOT Activated
    Layer 3 Status:
0 Active Layer 3 Call(s)
--More--                               Active dsl 13 CCBs = 0
    The Free Channel Mask: 0x80000003
    Total Allocated ISDN CCBs = 0
#sh ccm-manager
MGCP Domain Name: xxxxx.com
Priority        Status                   Host
============================================================
Primary         Registered               x.x.x.x
First Backup    None
Second Backup   None
Current active Call Manager:    x.x.x.x
Backhaul/Redundant link port:   2428
Failover Interval:              30 seconds
Keepalive Interval:             15 seconds
Last keepalive sent:            11:10:43 AEDST Nov 21 2013 (elapsed time: 00:00:11)
Last MGCP traffic time:         11:10:43 AEDST Nov 21 2013 (elapsed time: 00:00:11)
Last failover time:             None
Last switchback time:           None
Switchback mode:                Graceful
MGCP Fallback mode:             Enabled/OFF
Last MGCP Fallback start time: 05:28:32 AEDST Nov 18 2013
Last MGCP Fallback end time:    11:57:01 AEDST Nov 20 2013
MGCP Download Tones:            Disabled
TFTP retry count to shut Ports: 2
Backhaul Link info:
    Link Protocol:      TCP
    Remote Port Number: 2428
    Remote IP Address: x.x.x.x
    Current Link State: OPEN
    Statistics:
        Packets recvd:   3
        Recv failures:   0
        Packets xmitted: 5
        Xmit failures:   0
    BRI Ports being backhauled:
        Slot 0, VIC 0, port 1
        Slot 0, VIC 0, port 0
        Slot 0, VIC 3, port 1
Configuration Auto-Download Information
=======================================
Current version-id: 1384908973-2cefe363-d1ae-423b-a6ef-a85a0d4216af
Last config-downloaded:00:00:00
Current state: Waiting for commands
Configuration Download statistics:
Download Attempted             : 6
Download Successful          : 3
Download Failed              : 1
TFTP Download Failed         : 8428
Configuration Attempted        : 3
Configuration Successful     : 3
Configuration Failed(Parsing): 0
Configuration Failed(config) : 0
Last config download command: New Registration
FAX mode: disable
Configuration Error History:
Regards,
Suthakar

Configuring BRI interface for Voice ( MGCP gateway

hi there,
i have a Call Manager which is connect to Cisco 2800 series acting as MGCP getway. ISDN connection between the 2800 and the carrier ( telestra sydney ). the call manager is seeing the gateway and i have configured a numbering plan on the call manager for the phones. the phones can call internally but externally i dont what configuration i should configure under the BRI interface for the carrier ( telestra ) to recongnise my number plan. please if you have any demo configuration or configuration that has perviously used post to me.

this is a basic MGCP config on the Gateway on your area
BRI Switchtype Information
BRIs in Australia require no service profile identifiers (SPIDs).
There are two ISDN switch-types that can be used:
basic-net3?Currently the most commonly used.
basic-ts013?For older ISDN switches such as MicroLink.
isdn switch-type basic-net3 or 5
voice-card 2
dspfarm
dsp services dspfarm
controller T1 2/0
description T1 link to SRST
framing esf !--- Automatic method automatically adds
clock source internal
linecode b8zs !--- Automatic method automatically adds
cablelength short 133
pri-group timeslots 1-2,24 service mgcp !--- Automatic method
!--- automatically adds 24 channels.
!---You can manually edit channels.
description T1 link to SRST
interface Serial2/0:23
no ip address
isdn switch-type primary-ni !--- Automatic method automatically adds
isdn protocol-emulate network !--- Simulated Lab ISDN
isdn bind-l3 ccm-manager !--- Allows all Q931 to be backhauled over TCP to
!--- CallManager; automatic method automatically adds
no cdp enable !--- Automatic method automatically adds
ccm-manager mgcp
ccm-manager music-on-hold
ccm-manager config server 171.69.103.225
ccm-manager config !--- Enables automatic config download from CallManager
!--- Automatic method automatically adds these commands
mgcp
mgcp call-agent 171.69.103.225 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
no mgcp package-capability fxr-package
mgcp package-capability pre-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp rtp payload-type g726r16 static
mgcp profile default

ISDN BRI "Requested facility not subscribed" on debug isdn q931

I'm setting up a new Callmanager Express site. I'm using VIC2-2BRI ports on a 2821 running 12.4 (3a) CCME Version 3.3
When I try and place or receive a call across the BRI circuits, I get this error message on "debug isdn q931".
May 30 15:19:02: ISDN BR0/0/0 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x55
Cause i = 0x82B2 - Requested facility not subscribed
May 30 15:19:02: ISDN BR0/0/0 **ERROR**: L3_BadPeerMsg: event 0x5A cr 0xD5 callid 0x0
Everything looks good at layer 1 and 2 using "show isdn status".

Here is the meaning of your output. Cause i = 0x82B2
82 Means Telco switch sent it.
B2 Requested facility not subscribed
The remote equipment supports the supplementary service by subscription only.
Here are a couple of things that could cause it. The first one I ran into before.
This cause indicates that the network cannot provide the supplementary service that the user requests. The user has probably not completed the necessary administrative arrangements with the supporting networks.
I have run into this before on PRI, not sure if this will work on BRI. Try setting the below command on the BRI interface. This will remove outbound calling name display but will probably fix your issue. If you require the service talk to TELCO to get it subscribed.
"no isdn outgoing ie facility"
Also these below if disable outgoing ie on the BRI doesnt work.
The ISDN network can also return this cause code when a user makes a call attempt, but does not enter the SPIDs, or enters the SPIDs incorrectly. Ensure that your SPIDs are correct, or contact your telco to verify your SPIDs.
Also verify the speed of the outgoing call that the ISDN network supports (56k or 64k).

Isdn bri one branch to dial multiplcae isdn bri

I purchase four cisco router 1841 and four isdn BRI for cisco router for connecting diffrent four location through ISDN Phone line.
sir, we want to each one comunicate to other three on demand using defined dialer to each branch.
Sir help me how to configure ethernet 0/0, bri0/0/0 and Dialer profile.
Please send me compliter Script for my location for router above.

I've entered the "isdn transition-delay 1" interface command and things seem to work well.According to the IOS help on my router,this command clears the ISDN D-CHANNEL after a delay of 1 second.
But i would like to get more information on this command, and also on the isdn layer 2 and 3 timers, and even possible on all the "isdn" interface command option.
THANKS

Problem connecting isdn bri voice interface to pstn

i'm trying to configure my ISDN BRI NT/TE voice interface card (VIC-2BRI-NT/TE) on router 3825 to link to my PSTN provider. This must allow my Cisco IP phones to pass call to the PSTN through my call manager 4.1.
I suscribe to two isdn line. The provider told me that the SWITCH TYPE is VN6 (COTE d'IVOIRE or Ivory Coast).
For my bri configuration, see file "interfaces configuration..."
My problem is that when i pass call from my Ip telephony network, the first call goes well. But after this first call, when i type the command isdn status, i can see that the layer 1 of my isdn interfaces are DEACTIVATED, and after a few minutes, it turn back to ACTIVE. During these minuite, i can't pass any call through my isdn interface.
for outputs of show isdn status command, and isdn debug q931 commands
see file "show isdn status and debug..."
Notice: when the status of the isdn layer is in the deactvated status, i can receive call from the pstn, but i can't passe call to pstn (the state changes to ACTIVE when incomming call from pstn arrive, but still stay DEACTIVATED when outgoing call is initiated)
Please help me

I've entered the "isdn transition-delay 1" interface command and things seem to work well.According to the IOS help on my router,this command clears the ISDN D-CHANNEL after a delay of 1 second.
But i would like to get more information on this command, and also on the isdn layer 2 and 3 timers, and even possible on all the "isdn" interface command option.
THANKS

Understanding ISDN BRI Voice Interface Cards

Hi all,
I was wondering about the VIC-2BRI-NT/TE VIC:
In NT mode, what kind of BRI interface I can connect to it? Is it a BRI S/T interface (The device that is been connected to it)?
I got a PBX that has BRI S/T interfaces... can i connect them to this card (while in NT state)?
Will DID work in this case?
Thanks,
Edy.

Hi Malleyne,
Thanks for the response.
I looked at the document, and I found my answers indeed. The only way to understand from the document (or any other on the net) that it will connect to an S/T interface is by the fact is says it acts as a NT1 device. Couldn't they make it more simple? :)
Thanks again,
Edy.

ISDN BRI S/T 2 BRI S/T

Hi,
I have a 2621 with a WIC 1B S/T card and a 2811 with a WIC 1B S/T V3 card
I have connected the two ports with an ethernet cable and configured the 2 Interfaces but I can't ping neither of the interfaces......is this because I don't have a "proper" D channel???
Is there anyway of establishing a link between the two routers using the ISDN interfaces ........ for testing purposes??
interface BRI0/1/0
ip address 84.94.34.84 255.255.255.240
dialer idle-timeout 2147482
dialer map ip 84.94.34.94 name SAMS_router
dialer-group 1
isdn switch-type basic-net3
isdn spid1 51055530000001 5553000
dialer-list 1 protocol ip permit
Thank you for any help........

To answer your questions.. Yes, you need a D-channel. You cannot just connect the two ports together on a BRI and expect to get connected locally. The only way to test the BRI is to attach your ISDN service to the ports and test them out. You may be able to get a test ISDN number from your carrier provider that allows you to call the special number and it is a loopback. Or you can use the ISDN call command that allows you to make a test call to verify your ISDN service.To verify ISDN service you can use the show isdn status command to verify your layers 1 through 3. Also you can use debug isdn q921 or debug isdn q931 for any troubleshooting issues..Good Luck....

ISDN BRI backup - Disconnect after 1 sec

There is a ISDN BRI backup to Serial IF on a router.BRI seems to be able to cennect with opossite site, but after 1 sec comes Disconnect(see attachment).I tried Floating static routes and Dialer watch as well, with the same result. Can anybode help me? Thanks

There is no aaa new-model statment on both side.I`ve rewrite user/psw and added ppp chap hostname ... command.
output of isdn status follows:
cpp-poprad#
Sep 20 14:52:00.647: %DIALER-6-BIND: Interface BR0/1/0:1 bound to profile Di0
Sep 20 14:52:00.651: %LINK-3-UPDOWN: Interface BRI0/1/0:1, changed state to up
Sep 20 14:52:00.651: %ISDN-6-CONNECT: Interface BRI0/1/0:1 is now connected to 0524684841 N/A
Sep 20 14:52:01.655: %ISDN-6-CONNECT: Interface BRI0/1/0:1 is now connected to 0524684841 cpp-poprad
Sep 20 14:52:01.655: %ISDN-6-DISCONNECT: Interface BRI0/1/0:1 disconnected from 0524684841 cpp-poprad, call lasted 1 seconds
Sep 20 14:52:01.659: %LINK-3-UPDOWN: Interface BRI0/1/0:1, changed state to down
Sep 20 14:52:01.659: %DIALER-6-UNBIND: Interface BR0/1/0:1 unbound from profile Di0sh isdn statu
Global ISDN Switchtype = basic-net3
ISDN BRI0/1/0 interface
dsl 2, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 71, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 2 CCBs = 0
The Free Channel Mask: 0x80000003
Total Allocated ISDN CCBs = 0
cpp-poprad#sh isdn act
ISDN ACTIVE CALLS
Call Calling Called Remote Seconds Seconds Seconds Charges
Type Number Number Name Used Left Idle Units/Currency
cpp-poprad#
Sep 20 14:52:18.295: %LINK-3-UPDOWN: Interface BRI0/1/0:1, changed state to up
Sep 20 14:52:18.295: %DIALER-6-BIND: Interface BR0/1/0:1 bound to profile Di0
Sep 20 14:52:18.299: %ISDN-6-CONNECT: Interface BRI0/1/0:1 is now connected to 05246848411 N/A
Sep 20 14:52:18.351: %ISDN-6-CONNECT: Interface BRI0/1/0:1 is now connected to 05246848411 cpp-poprad
Sep 20 14:52:18.531: %LINK-3-UPDOWN: Interface BRI0/1/0:1, changed state to down
Sep 20 14:52:18.531: %DIALER-6-UNBIND: Interface BR0/1/0:1 unbound from profile Di0sh isdn act

Connecting to an ISDN BRI on a router from a PSTN line from remote site..!!

Friends,
I have a 1812 at HO with WIC1 BS/T Card, connected it to an ISDN BRI line.One of my critical remote location uses Leased circuit to reach my HO Router.But in case if LL goes down,some of the important PC's at the remote site should be able to dial to HO Router BRI Number using PSTN line, get connected and continue, ip address assigned from HO Router and access the application... Is any way available...

Hi Arnab.
You need to configure dial backup through AUX port. You need to connect a normal PSTN line to a modem which in turn is connected to your AUX port. You will have to configure a chat script which you can find in the attachmnet. The attachment is a working example in one of my routers.
You also have to create an ASYNC interface. Check that in the attached file also
--Pls rate if useful---

Is there a way to unify multiple Voice ISDN-BRI to single group?

I'm just wondering is there a way to unify multiple BRI interfaces in signle than to include it in the dial-peer for easier call routing.
Thanks in advance

Absolutely, trunk-groups:
int bri x/y
trunk-group telco
dial-peer voice 100 pots
destination-pattern ...
trunkgroup telco
Then, under "trunk group telco" you can optionally configure translation-profiles, hunt schemes and other things. "show trunk group" will give you the status of all the circuits in there.
Hope this helps, please rate post if it does!

ISDN(BRI) to PBX

Hi, I have a small problem with an NM-8B-S/T connecting to a PBX. (Ericson with Basic Rate Card in it).
All ISDN Layers are active, when I dial into the router, I get the following in the debug. (see attached txt file.)
Anyone have any ideas on this one? What does this imply?
*Mar 6 1993 10:09:38.535 UTC: ISDN BR2/0 **ERROR**: accept_incoming_csm_call: modem problem Requested circuit/channel not available(0x2C): b channel 0, call id 0x175
I did an ISDN test call from the BRI2/0 interface and the call went out successfully, Dial in does as per the below and never succeeds.

I suggest you go through the ISDN troubleshoot flowchart. It can helps.
http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080094bb8.shtml
Otherwise, did you confirm there is no configuration issue at PBX side ?
Referring to the "Dial commands reference", marked bad may be the firmware problem of the modem, try "no modem bad" and upgrade the modem firmware.
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a00801a7f1e.html#wp1115576

No dialer command under ISDN BRI interface

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