Stewie,

There are two things you can do..

1. add dtmf package to your mgcp config

mgcp package-capability dtmf-package

2. configure mgcp dtmf to use low bit rate codcec

mgcp dtmf-relay voip codec low-bit-rate mode out-of-band

3. Once you have done the above two, reset mgcp with no mgcp/mgcp

test again and send us

debug mgcp packets

Ayodeji,

Ok. Before any suggested changes config from CUCM and MGCP gw were the following:

#sh run | i dtmf|package
mgcp dtmf-relay voip codec all mode out-of-band
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp package-capability fm-package
no mgcp package-capability res-package

+ CUCM (see the screenshot CUCM-MGCPGW-Config-PSCL).

The problem persists. Then

#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
(config)#mgcp package-capability ?
  as-package      Select the Announcement Server Package
  atm-package     Select the ATM Package
  dtmf-package    Select the DTMF Package
  fm-package      Select the FM Package
  fxr-package     Select the FXR Package
  gm-package      Select the Generic Media Package
  hs-package      Select the Handset Package
  it-package      Select the IT Package
  line-package    Select the Line Package
  mdr-package     Select the MDR Package
  mf-package      Select the MF Package
  pre-package     Select the PRE Package
  res-package     Select the RES Package
  rtp-package     Select the RTP Package
  script-package  Select the Script Package
  srtp-package    Select the SRTP Package
  sst-package     Select the SST Package
  trunk-package   Select the Trunk Package

(config)#mgcp package-capability dtmf-package ?
  <cr>

(config)#mgcp package-capability dtmf-package
(config)#
(config)#mgcp dtmf-relay voip codec low-bit-rate mode out-of-band
(config)#
(config)#no mgcp
WARNING: no mgcp: Teardown MGCP application may take a while to clean up resources
(config)#
Jan 22 15:43:27.638 MSK: %MGCP_APP-6-MGCP_SHUTDOWN_COMPLETE: MGCP Shutdown has completed
(config)#
(config)#mgcp
(config)#
(config)#end

#sh run | i dtmf|package
mgcp dtmf-relay voip codec low-bit-rate mode out-of-band
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp package-capability fm-package
no mgcp package-capability res-package

#wr
Building configuration...
[OK]
#

Test - the problem persists (see debug output from file 'debug.txt').
Seems every test call attempt different digits of the same extension are relayed but always incomplete.

Call history shows all my attempts were using inband-voice.

#show call hist vo | i mf        
tx_DtmfRelay=inband-voice
tx_DtmfRelay=inband-voice
tx_DtmfRelay=inband-voice
tx_DtmfRelay=inband-voice

Stewie,

Sorry for the late reply..

Having looked at the logs and description there are few pointers as to what is going on here..

1. We could be looking at a dsp issue/tone generation issue

2. IOS bug that is mgcp related

To look further lets ensure that the digit are been generated by the gateway please send the ff:

debug vpm signal

debug vtsp tone

debug mgcp packet

NB: Do you hear the tones on the phone when you dial them?

 Ayodeji,

Yes, I hear the tones when I dial them.

It seems only 'debug mgcp packets' generates output (there is no output at all for vtsp & vpm only debug) and I've attached its corresponding data.
Actually for dialing 20055 extension we've got the following result:

1st attempt - only 20 were relayed
2nd attempt - only 05 were relayed
3rd attempt - only 205 were relayed

#debug vtsp tone
This CLI command is now 'debug voip vtsp tone'

#debug voip vtsp tone
voip vtsp tone debugging is on
#debug vpm signal
Voice Port Module signaling debugging is enabled
#debug mgcp packet
Media Gateway Control Protocol packets debugging for all endpoints is on

#sh deb              
VTSP:
  debug voip vtsp tone is ON (filter is OFF)
Voice Port Module signaling debugging is on
MGCP:
  Media Gateway Control Protocol packets debugging is on

#sh ver | i IOS    
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(24)T6, RELEASE SOFTWARE (fc2)
#sh inv | i chassis
NAME: "2851 chassis", DESCR: "2851 chassis"

Hi Stewie,

Lets try this..

debug vtsp dsp.

I just want to ensure that the vtsp module is sending the digits to the gateway after it has received them. So we can narrow down where the issue is.

I don't just want to jump to any conclusions. I am leaning towards upgrading the ios on the gateway but lets see I we see anything on this debug first

 Ayodeji,

Voice gateway always keeps silence for this debug either for successfull or unsuccessfull relays.
 
#debug vtsp dsp
This CLI command is now 'debug voip dsm dsp'
#debug voip dsm dsp
DSP Stream Manager dsp debugging is on

#sh deb
DSM:
  debug voip dsm dsp is ON (filter is OFF)

Can you upgrade IOS

 Ayodeji, Abdel,
 
Can you recommend which IOS version to prefer? Current release:

#sh ver | i IOS    
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(24)T6, RELEASE SOFTWARE (fc2)
#sh inv | i chassis
NAME: "2851 chassis", DESCR: "2851 chassis"
#sh ver | i bin         
System image file is "flash:c2800nm-advipservicesk9-mz.124-24.T6.bin"

I've also made a check against Cisco Download Software section and found the following:

12.4 - 12.4.25g(MD) [c2800nm-advipservicesk9-mz.124-25g.bin]
12.4T - 12.4.24T8(ED) [c2800nm-advipservicesk9-mz.124-24.T8.bin]

ISR's DRAM/Flash config is 256/128 and abovementioned are good with this.

Also I've changed GW's parametr 'Type Of DTMF Relay' on CUCM from 'Out of Band' to 'Current GW Config' with GW reset.
Its config didn't changed after that and stays the same. Problem also persists.

#sh run | i dtmf|package
mgcp dtmf-relay voip codec low-bit-rate mode out-of-band
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp package-capability fm-package
no mgcp package-capability res-package

Hi Stewie

My first choice would have been to go to the later 15.1 M release, but as the constrain in your DRAM/FLASH, I would believe 12.4T - 12.4.24T8(ED) [c2800nm-advipservicesk9-mz.124-24.T8.bin] could be tried first to see if the problem still persist .

Thanks

MonieM

 Abdel, Ayodeji,

Current time I'm running on 12.4.24T8(ED) [c2800nm-advipservicesk9-mz.124-24.T8.bin].
Unfortunately the problem still persist.

Can you, please, advice next steps in troubleshooting this issue.

Gentlemen,

Any ideas? Thank you.

Hi Stewie

I have reviewed the original traces one more time and I can see some of the digits get sent Out-of-band, but some might not be, in which it is a suspect in the firmware interpertation of the digits or DSPs. I see also the negotiation accepts the NSE in-band DTMF relay, could you inforce it int he configuration and negotiate only inband and see if this will make any difference.

You can choose NSE or NTE-GW.

mgcp dtmf-relay voip codec all mode nse

or

mgcp dtmf-relay voip codec all mode nte-gw

and collect same debugs please

Abdel,

Niether of the two did not resolve the issue which is the same.

debug voip vtsp tone
debug vpm signal
debug mgcp packet