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New Member

MGCP Fallback issues

Hi Voice Community,

I recently configured my Voice Gateway (ISR 2921) for ccm-manager MGCP fallback. I was able to register the gateway and the T1 with my call manager (CUCM 9.1).  I also have SRST configured and pointed to the gateway's address as the reference.  I was able to test it successfully making calls out to the PSTN, etc. 

Once I took away the connection to the call manager away, the gateway went into SRST mode as it should.  My phones were now referencing the gateway to do the call processings.

My problem is that I performed a "wr mem" while MGCP fallback mode was in "Enable/On". 

Once I restored teh connection to the call manager, everything reregistered to the call manager, however I am now getting a fast busy signal when making a call to PSTN via T1/CAS.

I read up that the device runs some type of script in the background once it goes into MGCP fallback mode.  Is there anyway to reverse that?

11 REPLIES

MGCP Fallback issues

Try "no mgcp" wait for the teardown and then type "mgcp"

HTH

Regards,

Yosh

HTH Regards, Yosh
New Member

Re: MGCP Fallback issues

unfortunately, that did not help....

I even tried to wipe the configurations and start new with no success...

MGCP Fallback issues

Hi Duy,

Bounce the MGCP stack as  Yosh said. Can also post your config for us.

Regards,

Kevin

New Member

MGCP Fallback issues

Hi Kevin,

I have tried to boune the MGPC stack with no success after bringing it back up.  Please see my configurations below:

----------------------------------------------------

!

card type t1 0 1

!

network-clock-participate wic 1

network-clock-select 1 T1 0/1/0

!

!

voice-card 0

!

!

voice service voip

fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none

h323

modem passthrough nse codec g711ulaw

modem relay latency 100

modem relay sprt v14 receive playback hold-time 25

!

!

application

global

  service alternate default

!

!

license udi pid CISCO2921/K9 sn FTX1643AK1P

license accept end user agreement

license boot module c2900 technology-package securityk9

license boot module c2900 technology-package uck9

license boot module c2900 technology-package datak9

hw-module pvdm 0/0

!

!

!

dial-control-mib retain-timer 1000

dial-control-mib max-size 1200

!

!

controller T1 0/1/0

cablelength long 0db

ds0-group 0 timeslots 1-24 type e&m-wink-start

!

controller T1 0/1/1

cablelength long 0db

!

!

interface GigabitEthernet0/1

ip address 10.255.2.75 255.255.255.192

no ip redirects

no ip unreachables

no ip proxy-arp

duplex auto

speed auto

!

!

!

control-plane

!

!

voice-port 0/1/0:0

timeouts interdigit 5

!

ccm-manager fallback-mgcp

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 10.255.2.101

ccm-manager download-tones

!

mgcp

mgcp call-agent 10.255.2.101 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 modem relay voip sprt v14 transmit hold-time 15

mgcp codec g729r8 packetization-period 60

mgcp package-capability rtp-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

no mgcp timer receive-rtcp

mgcp sdp simple

!

mgcp profile default

!

sccp local GigabitEthernet0/1

sccp ccm 10.255.2.101 identifier 1 version 7.0

sccp

!

sccp ccm group 1

associate ccm 1 priority 1

!

dial-peer voice 1000 pots

service mgcpapp

port 0/1/0:0

!

dial-peer voice 4 pots

description PSTN

destination-pattern 9..........

port 0/1/0:0

forward-digits all

!

gateway

timer receive-rtp 1200

resource threshold high 96 low 90

!

sip-ua

no transport udp

no transport tcp

!

gatekeeper

shutdown

!

telephony-service

max-ephones 10

max-dn 20

ip source-address 10.255.2.75 port 2000

auto assign 1 to 5 type 7965

auto assign 1 to 5 type 7960

timeouts interdigit 5

system message Operating under SRST

max-conferences 12 gain -6

transfer-system full-consult

!

!

ephone  1

device-security-mode none

!

MGCP Fallback issues

Firstly your missing service mgcp under the controller:

controller T1 0/1/0

cablelength long 0db

ds0-group 0 timeslots 1-24 type e&m-wink-start

Secondly missing the bind command:

mg bind media source interface gi 0/0

mg bind control source interface gi 0/0

check the output of the show controller t1 0/1/0, see if its up.

Rate the post accordingly.

Regards,

Kevin

Re: MGCP Fallback issues

put "ccm-manager config" and then bounce "mgcp"

HTH

Regards,

Yosh

HTH Regards, Yosh

Re: MGCP Fallback issues

Hi Duy,

Are you able to receive incoming calls?

Please share the output of "show isdn status" and also share your full running configuration "show runnning-config".

Also let us know which controller you are using.

Regards,
Nishant Savalia

Regards, Nishant Savalia

Re:MGCP Fallback issues

Here is the doc:
Make sure domain name is right on the cucm:

Show ccm-manager


http://www.cisco.com/c/en/us/support/docs/voice/media-gateway-control-protocol-mgcp/43802-mgcp-t1-cas-ccm.html

@ nishant bud and its T1 CAS "show ISDN status" won't be helpful.


Sent from Cisco Technical Support Android App

Re:MGCP Fallback issues

It doesn't seems to be domain name issue unless and until domain name is modified because previously it was registered with CUCM.

Before restoring connection with CUCM you saved the configuration that means at this point CUCM is not handling calls and to make voice gateway to be responsible for managing calls and treat it as H.323, system will remove commands responsible for registering with CUCM and to register it with CME.

So when you saved the configuration it is quite possible that again gateway will not register with CUCM due to lack of commands. You could have check the configuration after restoring connection with CUCM.

What you can do is paste the output of "show ccm-manager" and also let us know the status of MGCP gateway in CUCM (registered / unregistered / unknown).

As you have also tried with reconfiguration at this point it should work, provided gateway is in registered state in CUCM.

If it is registered then share output of "debug vtsp all"

Also let us know the IOS version you are running.

@Kevin:- Thank you for drawing my attention.

Regards,
Nishant Savalia

Regards, Nishant Savalia
New Member

Re:MGCP Fallback issues

Hi all,

Thank you all for providing input. 

within CUCM, the gateway  and T1 CAS is "registered".

Another thing that I noticed is that my voice port originally started as voice-port 0/1/0:0.  For what ever reason, it is now voice-port 0/1/0:1.  (Im not sure if someone logged in an changed that or if it had changed somehow).  In any case, I configured the dial-peers to reflect that port change. ie: 

dial-peer voice 1000 pots

service mgcpapp

port 0/1/0:1

------------------------------------------------------------------------------------

Below is my output for show CCM-Manager:

-------------------------------------------------

isr-01#show ccm-manager

MGCP Domain Name:isr-01.test.test

Priority        Status                   Host

============================================================

Primary         Registered               10.255.2.101

First Backup    None

Second Backup   None

Current active Call Manager:    10.255.2.101

Backhaul/Redundant link port:   2428

Failover Interval:              30 seconds

Keepalive Interval:             15 seconds

Last keepalive sent:            14:52:50 UTC Feb 20 2014 (elapsed time: 00:00:09)

Last MGCP traffic time:         14:52:50 UTC Feb 20 2014 (elapsed time: 00:00:09)

Last failover time:             None

Last switchback time:           None

Switchback mode:                Graceful

MGCP Fallback mode:             Enabled/OFF

Last MGCP Fallback start time:  13:58:00 UTC Feb 20 2014

Last MGCP Fallback end time:    14:00:05 UTC Feb 20 2014

MGCP Download Tones:            Enabled

        Custom Tone 1 : United States

TFTP retry count to shut Ports: 2

FAX mode: disable

Configuration Error History:

----------------------------------------------------------------------

New Member

Re:MGCP Fallback issues

Hi all,

I corrected my issue, but I'm not sure if this is the correct resolution.

I ended up taking away all of the configurations pertaining to voice, and to the controllers.  I reconfigured the ISR with my configs including making the change from voice-port 0/1/0:1 to voice-port 0/1/0:0. It seems to have fix it. 

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