12.4.24T loses T.38 MGCP configuration

Answered Question
Apr 15th, 2010

I've now experienced this issue with 12.4.24T and 12.4.24T3 on multiple Cisco 2811's.  We configure the following MGCP like this:

mgcp
mgcp call-agent 10.10.10.10 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode nse
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp default-package fxr-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 ecm
mgcp fax t38 ls_redundancy 2
mgcp fax t38 hs_redundancy 2
mgcp fax-relay ans-disable
mgcp rtp payload-type g726r16 static
mgcp bind control source-interface Vlan2
mgcp bind media source-interface Vlan2

After a reboot, T.38 is always disabled:

mgcp
mgcp call-agent 10.10.10.10 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode nse
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp default-package mt-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 ecm
mgcp fax t38 inhibit
mgcp fax t38 ls_redundancy 2
mgcp fax t38 hs_redundancy 2
mgcp fax-relay ans-disable
mgcp rtp payload-type g726r16 static
mgcp bind control source-interface Vlan2
mgcp bind media source-interface Vlan2

Any idea how to fix this and keep T.38 enabled across reloads?  Is this a bug?

I have this problem too.
0 votes
Correct Answer by Rob Huffman about 4 years 4 days ago

Ho Jordan,

I think you are hitting this bug;

CSCta26864            Bug Details

MGCP fax T38 inhibit and ecm configured upon reload

Symptom:

On a Cisco MGCP gateway registered to  Cisco Unified Callmanager server, running
IOS 124-24T we have enabled  T38. But after a reload following
command lines are seen in the  configuration and all T38 faxes fail:

mgcp fax t38 ecm
mgcp  fax t38 inhibit

Conditions:

Specific to  MGCP T38 fax. The command "ccm-manager config" needs to be
enabled  to cause this issue.

Debug capture during boot up will show:
000386:  Jun 18 21:58:06.588: cmapp_xml_cfg_router: configuring
[mgcp fax  t38 inhibit]


Workaround:

This issue is not  seen in Cisco IOS images 124-15T9 and 124-20T3.

You can also  manually configure this after the reload:
mgcp default-package  fxr-package (if need be)
no mgcp fax t38 inhibit
no mgcp fax t38  ecm

and then reset the gateway from the Callmanager

Status
Fixed             

Severity        
3 - moderate


Last Modified
In Last 2 weeks        

Product
Cisco IOS software         

Technology


1st Found-In
12.4(24)T
12.4(24.6)T9       
      Known Affected Versions This link will launch a new window.

     
Fixed-In
12.4(24)MD
12.4(24)T2
15.1(0.7)T
15.1(0.2)PI12f
15.0(1)M0.5
15.1(24.6.12)PIL13
12.4(22)T4
15.1(1)XB
15.1(0.2.7)PIB13
15.1(1.5.1)PIA13
15.1(0.0.10)PIL14

Cheers!

Rob

Please support CSC Helps Haiti

https://supportforums.cisco.com/docs/DOC-8895

https://supportforums.cisco.com/docs/DOC-8727

  • 1
  • 2
  • 3
  • 4
  • 5
Average Rating: 5 (1 ratings)
Correct Answer
Rob Huffman Fri, 04/16/2010 - 07:49

Ho Jordan,

I think you are hitting this bug;

CSCta26864            Bug Details

MGCP fax T38 inhibit and ecm configured upon reload

Symptom:

On a Cisco MGCP gateway registered to  Cisco Unified Callmanager server, running
IOS 124-24T we have enabled  T38. But after a reload following
command lines are seen in the  configuration and all T38 faxes fail:

mgcp fax t38 ecm
mgcp  fax t38 inhibit

Conditions:

Specific to  MGCP T38 fax. The command "ccm-manager config" needs to be
enabled  to cause this issue.

Debug capture during boot up will show:
000386:  Jun 18 21:58:06.588: cmapp_xml_cfg_router: configuring
[mgcp fax  t38 inhibit]


Workaround:

This issue is not  seen in Cisco IOS images 124-15T9 and 124-20T3.

You can also  manually configure this after the reload:
mgcp default-package  fxr-package (if need be)
no mgcp fax t38 inhibit
no mgcp fax t38  ecm

and then reset the gateway from the Callmanager

Status
Fixed             

Severity        
3 - moderate


Last Modified
In Last 2 weeks        

Product
Cisco IOS software         

Technology


1st Found-In
12.4(24)T
12.4(24.6)T9       
      Known Affected Versions This link will launch a new window.

     
Fixed-In
12.4(24)MD
12.4(24)T2
15.1(0.7)T
15.1(0.2)PI12f
15.0(1)M0.5
15.1(24.6.12)PIL13
12.4(22)T4
15.1(1)XB
15.1(0.2.7)PIB13
15.1(1.5.1)PIA13
15.1(0.0.10)PIL14

Cheers!

Rob

Please support CSC Helps Haiti

https://supportforums.cisco.com/docs/DOC-8895

https://supportforums.cisco.com/docs/DOC-8727

Yorick Petey Thu, 09/01/2011 - 10:04

Hi,

I have the exact same problem with 2900 and 3900 using 15.1(3)T, 15.1(3)T2 and 15.1(4)M1 releases.

I use "ccm-manager config" to download the MGCP configuration from CUCM 6.1.5 and each time I reload or a enter "no ccm config, ccm config" to force the download, all the mgcp config is reset to default.

Before the reload:

mgcp call-agent XXXXXXXXXXXXX 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

mgcp package-capability pre-package

mgcp default-package fxr-package

no mgcp package-capability res-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax rate 14400

mgcp fax t38 nsf 000000

no mgcp fax-relay sg3-to-g3

mgcp rtp payload-type g726r16 static

After the reload:

mgcp call-agent XXXXXXXXXXXXX service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode out-of-band

mgcp modem passthrough voip mode nse

mgcp package-capability rtp-package

mgcp package-capability sst-package

mgcp package-capability pre-package

mgcp default-package mt-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax rate 14400

mgcp fax t38 inhibit

mgcp fax t38 nsf 000000

no mgcp fax-relay sg3-to-g3

mgcp rtp payload-type g726r16 static

The problem is that I use now 2900 and 3900 ISR G2 routers, and the version 15.x is the minimum.

For the other routers (~10) I dont have problem because I use the 12.4(20)T3 and the config is well saved.

I will try older IOS versions but I would appreciate if someone can advice me directly.

Thank you for your help.

Yorick

Rob Huffman Thu, 09/01/2011 - 10:38

Hi Yorick,

Did you try 15.1(1)XB?

Fixed-In

Fixed-in

12.4(24)MD

12.4(24)T2

15.1(0.7)T

15.1(0.2)PI12f

15.0(1)M0.5

15.1(24.6.12)PIL13

12.4(22)T4

15.1(1)XB

15.1(0.2.7)PIB13

15.1(1.5.1)PIA13

15.1(0.0.10)PIL14

15.1(1.7.1)PIA14

12.4(24)GC2

12.4(22)MDA4

12.4(24)MDA1

15.1(0.0.3)PIL15

Cheers!

Rob

Yorick Petey Thu, 09/01/2011 - 11:05

Hi Rob,

Unfortunately, I cannot find it in the Download center.

I can only access to 15S, 15M, 15T and Special and Early, but no one contains a XB release .

Do you think I have to open a case to get it?

I am afraid now because I am pretty sure I have several customers with ISR G2, configured for T.38 on C2900 and C3900. If they reload the routers, no more faxes...

How is it possible a so severe problem is present in so many versions?

Maybe it is related to the version of our CUCM as well (6.1.5)?

I will do some tests tomorrow morning in a customer site owning a 2911 and using T.38 with CUCM 7.1.5.

Thank you for your help.

Yorick

Rob Huffman Thu, 09/01/2011 - 11:34

Hi Yorick,

I think a TAC case is an excellent idea. I'm guessing they can find a more current

IOS version that contains the fix for this and set it up for you as a special

download. You should not have to deal with this issue every time the router re-loads.

Cheers!

Rob

Yorick Petey Tue, 09/06/2011 - 00:54

Hi Rob,

For your information, a case is opened to troubleshoot this problem, I still don't get a satisfying answer but in the sametime I compared the same test with different CUCM version.

It seems that the problem only occurs with CUCM 6.1.x. I think it's because the CUCM 7.x and 8.x contain more MGCP parameters (t.38 package, and so on). MGCP config from CUCM webpages is very (too) basic in 6.x and I think in IOS 15.x some parameters are defaulting to a certain value when the parameter does not come populated from the CUCM.

I will post the update as soon as it will be resolved.

Yorick

steve_mils Fri, 07/20/2012 - 01:15

We've suffered with this problem for a number of years, across 2800s & 2900s; both CUCM versions 6 & 7; a range of IOS versions including 12.4T, 15.1 and 15.2.

Our latest incarnation is a 2951 running 15.2(3)T and CUCM 7.1.5.

It's sad to think that it's never been adequately solved!

Thanks, Steve

Actions

Login or Register to take actions

This Discussion

Posted April 15, 2010 at 7:06 PM
Stats:
Replies:7 Avg. Rating:5
Views:2697 Votes:0
Shares:0
Tags: No tags.

Discussions Leaderboard

Rank Username Points
1 21,026
2 15,047
3 10,314
4 7,999
5 4,856
Rank Username Points
140
95
72
66
55