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3620 modems do not respond to incoming calls

vsanavia
Level 1
Level 1

Hi,

I have a 3620 with the following hardware configuration:

Cisco Internetwork Operating System Software

IOS (tm) 3600 Software (C3620-IK9O3S-M), Version 12.2(8)T5, RELEASE SOFTWARE (fc1)

TAC Support: http://www.cisco.com/tac

Copyright (c) 1986-2002 by cisco Systems, Inc.

Compiled Sun 23-Jun-02 22:08 by ccai

Image text-base: 0x60008930, data-base: 0x61670000

ROM: System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

racsca01 uptime is 5 days, 4 hours, 5 minutes

System returned to ROM by power-on

System image file is "flash:c3620-ik9o3s-mz.122-8.T5.bin"

cisco 3620 (R4700) processor (revision 0x81) with 60416K/5120K bytes of memory.

Processor board ID 26863746

R4700 CPU at 80Mhz, Implementation 33, Rev 1.0

MICA-6DM Firmware: CP ver 2730 - 5/23/2001, SP ver 2730 - 5/23/2001.

Channelized E1, Version 1.0.

Bridging software.

X.25 software, Version 3.0.0.

Primary Rate ISDN software, Version 1.1.

1 FastEthernet/IEEE 802.3 interface(s)

12 terminal line(s)

1 Channelized E1/PRI port(s)

DRAM configuration is 32 bits wide with parity disabled.

29K bytes of non-volatile configuration memory.

32768K bytes of processor board System flash (Read/Write)

Configuration register is 0x3922

The modem module is inserted in Slot 0 while the FE & E1 module is inserted in Slot 1

The router has the following config:

version 12.2

service nagle

service tcp-keepalives-in

service tcp-keepalives-out

service timestamps debug datetime msec localtime show-timezone

service timestamps log datetime msec localtime show-timezone

service password-encryption

!

hostname racsca01

!

boot system flash c3620-ik9o3s-mz.122-8.T5.bin

logging buffered 16384 debugging

aaa new-model

!

!

aaa authentication login default group tacacs+ local

aaa authentication ppp default group tacacs+

aaa authorization exec default group tacacs+

aaa authorization commands 15 default group tacacs+

aaa authorization network default group tacacs+

aaa accounting exec default start-stop group tacacs+

aaa accounting commands 15 default start-stop group tacacs+

aaa accounting network default start-stop group tacacs+

aaa session-id common

enable secret 5 xxxxxxxxxx

!

username victor.s password 7 xxxxxxxxx

clock timezone GMT-4 -4

modem country mica e1-default

ip subnet-zero

!

!

no ip domain-lookup

ip domain-name yyy.yyyy.yyy

!

no ip bootp server

ip audit notify log

ip audit po max-events 100

async-bootp dns-server 172.30.32.24

async-bootp nbns-server 172.30.32.29

!

!

!

!

!

!

!

!

fax interface-type fax-mail

mta receive maximum-recipients 0

!

controller E1 1/0

framing NO-CRC4

ds0-group 0 timeslots 1 type r2-digital r2-compelled ani

cas-custom 0

country venezuela use-defaults

!

!

!

!

interface FastEthernet1/0

description To ACS

ip address 172.30.32.17 255.255.254.0

duplex auto

speed auto

!

interface Group-Async1

no ip address

encapsulation ppp

dialer in-band

dialer idle-timeout 10

dialer-group 1

async mode dedicated

peer default ip address pool dialin

ppp callback accept

ppp authentication chap pap

group-range 1 12

!

ip local pool dialin 10.98.1.15 10.98.1.39

ip classless

ip route 0.0.0.0 0.0.0.0 172.30.32.1

no ip http server

ip pim bidir-enable

!

!

access-list 100 permit tcp any host 172.30.32.16 eq tacacs

dialer-list 1 protocol ip permit

!

tacacs-server host 172.30.32.16 key xxxxx

tacacs-server timeout 20

radius-server host 172.30.32.16 auth-port 1645 acct-port 1646 key 7 xxxxxxxxx

radius-server retransmit 3

radius-server key 7 xxxxxxxxx

call rsvp-sync

!

!

mgcp profile default

!

dial-peer cor custom

!

!

!

!

!

line con 0

speed 115200

line 1 12

modem Dialin

transport input all

flowcontrol hardware

line aux 0

line vty 0 4

transport input ssh

!

!

end

It will answer incoming calls but it will not give a modem tone, this is the result from a debug in this situation:

*Mar 6 00:13:01.505 GMT-4: Modem 0/3 Mica: configured for Answer mode, with Lower R2 signaling, 0x0 tone detection.

*Mar 6 00:13:01.505 GMT-4: TDM: Begin slot/port:channel 1/0:0 allocation for Modem use

*Mar 6 00:13:01.505 GMT-4: M32 AR - channel 0

*Mar 6 00:13:01.509 GMT-4: TDM: Enabling modem no 3

*Mar 6 00:13:01.509 GMT-4: TDM: No Errors in channel allocation for modem, rc is 0x0

End of slot/port:channel 1/0:0 allocation for Modem

*Mar 6 00:13:01.617 GMT-4: Modem 0/3 Mica: in modem state CALL_SETUP

*Mar 6 00:13:31.617 GMT-4: Modem 0/3 Mica: dialing number '#'

*Mar 6 00:13:31.621 GMT-4: TDM: Begin deletion of slot/port:channel 1/0:0 used by Modem

*Mar 6 00:13:31.621 GMT-4: TDM: Disabling modem no 3

*Mar 6 00:13:31.621 GMT-4: M32 AR for Modem - channel 0

*Mar 6 00:13:31.633 GMT-4: M32 AR for Modem - channel 0

*Mar 6 00:13:31.641 GMT-4: TDM: End of slot/port:channel 1/0:0 deletion

*Mar 6 00:13:31.661 GMT-4: Modem 0/3 Mica: in modem state TERMINATING

*Mar 6 00:13:31.681 GMT-4: Modem 0/3 Mica: in modem state IDLE

*Mar 6 00:13:31.681 GMT-4: TDM: Begin deletion of slot/port:channel 1/0:0 used by Modem

*Mar 6 00:13:31.681 GMT-4: TDM: Disabling modem no 3

*Mar 6 00:13:31.693 GMT-4: TDM: End of slot/port:channel 1/0:0 deletion

*Mar 6 00:13:31.697 GMT-4: Modem 0/3 Mica: DISCONNECT after 00:00:00, due to reason (0x7F00) Host Disconnect.

*Mar 6 00:13:31.697 GMT-4: %MODEM_HIST-3-END_CALL: Mica Modem 0/3

Connect Protocol - Unkn, Compression - Unkn, Connected Standard - Unkn

Tx/Rx bit rate - 0/0

Call Time - 00:00:00, Disconnect Reason (0x7F00) - Host Disconnect

0 retrains and/or speed shifts, 0 ec retransmissions requested

0 chars tx, 0 chars rx, 0 chars rx bad

0 ppp packets tx, 0 ppp packets rx, 0 ppp packets rx bad

0 ec packets tx, 0 ec packets rx, 0 ec packets rx bad

0 v110 packets tx, 0 v110 packets rx, 0 v110 packets rx bad, 0 v110 sync loss

Any ideas on what might be happening?.

Regards,

VS

15 Replies 15

Leo,

Thanks very much for your help.

Turns out the problem was due to a configuration parameter on the Siemens PBX. The PBX was expecting a dial-tone from the router trunk, the router was unable to provide it so the PBX kept dropping the calls.

After changing this, we were able to receive calls but had to change the IOS from 12.2(8)T5 to 12.2(6h) because callback was not working.

I will post to see if one can tune the digital modems to force that the upstream speed (in a callback case, from the RAS to the dial-up client) be higher than the downstream speed. I've been only to reach high speeds (>50kbps) without callback. Any tips?

BR,

VS

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