E1 channels and T38 protocol gets disabled automatically.

[waqas sardar]

Dear Team,

After restart of the gateway no outgoing calls due to change of E1 channels from 10 to 24 and also T38 protocol gets disabled automatically.

What are the possible solutions?

Best Regards,

[Anas Abueideh]

Hi,

can you share your GW config? did find issue on all channels ?


Anas

Sent from Cisco Technical Support Android App

[Rob Huffman]

Hi Wagas,

What IOS are you running?

Cheers!

Rob

"Hours are like diamonds, don't let them waste
Time waits for no one, no favors has he" 

- Stones

[waqas sardar]

Can you please send the link for IOS upgradation ,If its require to upgrade IOS.

Regards,

waqas

[barry · Accepted solution]

Waqas

There are probably hundreds of threads on this forum covering this issue. The problem here is that MGCP doesn't support fractional T1/E1. Every time the gateway refreshes its config from CUCM, the number of channels gets reset.

Try configuring:

no ccm-manager config

This will stop this happening. However, personally I would convert your MGCP config to H.323. I seem to hit problems/bugs with MGCP all of the time.

HTH

Barry Hesk

Intrinsic Network Solutions

[Rob Huffman · Accepted solution]

Hi Wagas,

In addition to the great tips from Barry (+5 "B")

It sounds like this bug;

CSCta26864 - MGCP fax T38 inhibit and ecm configured upon reload

Description

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

Details

First Found in:                          (2)

12.4(24)T,12.4(24.6)T9

Status:

Fixed

Last Modified:

Feb 16,2013

Known Affected Versions:                          (325)

15.0(1)XA5,15.0(1)XA4,15.0(1)XA3,15.0(1)XA2

15.0(1)XA1,15.0(1)XA,12.4(9)XG5,12.4(9)XG4

More

Fixed in:                          (16)

15.1(24.6.12)PIL13,15.1(1.7.1)PIA14

15.1(1.5.1)PIA13,15.1(1)XB,15.1(0.7)T

15.1(0.2.7)PIB13,15.1(0.2)PI12f,15.1(0.0.3)PIL15

15.1(0.0.10)PIL14,15.0(1)M0.5,12.4(24)T2

12.4(24)MDA1,12.4(24)MD,12.4(24)GC2,12.4(22)T4

12.4(22)MDA4

Less

Product:

Cisco IOS Software

Platform:

Independent

Severity:

3 - moderate

Here is one "how to" IOS upgrade example

http://www.cisco.com/en/US/products/ps5855/products_tech_note09186a00801fc986.shtml

Cheers!

Rob

"Hours are like diamonds, don't let them waste
Time waits for no one, no favors has he" 

- Stones

[waqas sardar]

Please send me the link to download the suggested bug free IOS. ?