isdn is unable to backhaul to ccm manager

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May 24th, 2007
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Hi,


"isdn bind-l3 ccm-manager service mgcp" command is automatically missing from the isdn interface and all the phones are going down. This has been happening intermittently at several locations. When I re-issue the command, it works fine.


Can you please suggest the solution?


Many Thanks.

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George Venianakis Thu, 05/24/2007 - 04:09
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Hi prasad.manju,

can you please provide the config of your router as well as the sh ver output?

Cheers,

prasad.manju Thu, 05/24/2007 - 05:07
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hostname router

!

boot-start-marker

boot-end-marker

!

logging buffered 4096 debugging

enable secret xxxxx

!

no aaa new-model

!

resource policy

!

clock timezone gmt 0

clock summer-time BST recurring last Sun Mar 2:00 last Sun Oct 2:00

tdm clock bri-auto

mmi polling-interval 60

no mmi auto-configure

no mmi pvc

mmi snmp-timeout 180

voice-card 0

!

!

!

!

!

ip cef

no ip domain lookup

ip sla monitor responder

!

isdn switch-type basic-net3

!

voice rtp send-recv

!

voice service voip

modem passthrough nse codec g711ulaw

!

!

!

!

!

!

!

!

!

!

!

application

global

service alternate default

!

!

!

!

!

!

interface FastEthernet0/0

description IP Address for CCM Gateway

ip address E.F.G.H x.x.x.x

speed 100

full-duplex

!

interface BRI0/0

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

!

interface BRI0/1

no ip address

isdn switch-type basic-net3

isdn point-to-point-setup

isdn incoming-voice voice

isdn bind-l3 ccm-manager service mgcp

isdn static-tei 0

!

ip route 0.0.0.0 0.0.0.0 A.B.C.D

no ip http server

!

!

!

control-plane

!

!

voice-port 0/0

compand-type a-law

cptone GB

!

voice-port 0/1

compand-type a-law

cptone GB

!

ccm-manager fallback-mgcp

ccm-manager redundant-host W.X.Y.Z

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server P.Q.R.S P.Q.R.L

ccm-manager config

!

mgcp

mgcp call-agent W.X.Y.Z 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

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

mgcp rtp payload-type g726r16 static

!

mgcp profile default

!

!

!

!

dial-peer voice 91 pots

destination-pattern 9T

direct-inward-dial

port 0/0

!

dial-peer voice 92 pots

destination-pattern 9T

direct-inward-dial

port 0/1

!

!

call-manager-fallback

max-conferences 4 gain -6

limit-dn 7940 1

limit-dn 7960 2

timeouts interdigit 5

ip source-address E.F.G.H port 2000 strict-match

max-ephones 24

max-dn 24

transfer-pattern 1234....

time-format 24

date-format dd-mm-yy

!


router#sh ver

Cisco IOS Software, C1700 Software (C1700-SV8Y7-M), Version 12.4(5a), RELEASE SO

FTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by Cisco Systems, Inc.

Compiled Sat 14-Jan-06 04:18 by alnguyen

ROM: System Bootstrap, Version 12.2(7r)XM2, RELEASE SOFTWARE (fc1)

router uptime is 2 weeks, 3 days, 4 hours, 31 minutes

System returned to ROM by power-on

System restarted at 09:17:04 BST Mon May 7 2007

System image file is "flash:c1700-sv8y7-mz.124-5a.bin"

Cisco 1760 (MPC860P) processor (revision 0x600) with 116944K/14128K bytes of mem

ory.

Processor board ID FOC094000GV (2337081928), with hardware revision 0000

MPC860P processor: part number 5, mask 2

1 FastEthernet interface

2 ISDN Basic Rate interfaces

4 Voice NT or TE BRI interfaces

32K bytes of NVRAM.

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

Configuration register is 0x2102


MARTIN STREULE Thu, 05/24/2007 - 05:24
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If MGCP falls back to H323 the config is changed and this command is deleted automatically.


This is expected behaviour if the registration failes - you have "service alternate default" configured.


I had once an issue with this when the WAN link flapped.


-> check if you lose registration with CCM

-> check if router goes from MGCP to H323

-> check WAN connectivity (flaps?)


Possible that you have a SW issue when the gateway goes back from H323 to MGCP...


It's of course also possible that you have an IOS with some personality / bugs.


Cheers,

Martin

jconi Thu, 05/24/2007 - 08:23
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Hello,


To do MGCP BRI Backhaul, you need an IOS T Train, (12.4T), to make it work fine.

Your config has no problem at all.

cheers

jp

billy.brewingto... Thu, 05/24/2007 - 11:02
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I had a similar issue with my config rewriting on its own for supporting a PRI of less than 24 channels. A temporary workaround that was given to me was once the gateway is up and registered remove the "ccm-manager config" command once you reconfig the idsn backhaul on your BRI. This is something i used because the CallManager was overwriting parts of my config rather than deleting the line entirely. Hope it helps till you find something better.

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