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New Member

Cisco 2911 PRI dropping calls! Help!

Hi

I have a customer running CUCM 8.0 with 2 x 2911 routers on 15.0(1)M4 IOS. with 2 pcs PVDM3-32 and 1 VWIC2-2MFT-T1/E1.

On one of the ports they are running QSIG PRI againt a Ericsson MD110 and the other port is connected directly to a PRI 30 channel from a operator i Norway.

We are now getting drops on both these interfaces at the same time 2-5 times a day. When I look at the routers I see this error message:

%DSPRM-3-DSPALARM: Received alarm indication from dsp (0/1). Resetting the DSP.

According to Cisco this is a known problem on these routers with this IOS and their recommandations is to raise the

ecan-cancel coverage to 128. When I go to do this via the CCMadmin web on the endpoints I am not allowed to raise it to more then 64ms........When I force it to 128 directly on the router it doesn't show when I run Show running config but in the Show voice port 0/0/0:15 it says it is set to 128.

What is the correct thing here? Do I really need the EC-MFT-64 to get this thing to work or is it a fault that can be fixed with a IOS upgrade on the routers?

Hope there is someone out there that can help me in this case.

1 ACCEPTED SOLUTION

Accepted Solutions
Green

Cisco 2911 PRI dropping calls! Help!

Hi,

This is what the bug you are hitting says

CSCtj71414 Bug Details
DSP crash in ecan when max tail delay configured is 32ms
Symptom:

PVDM3 DSP in ISR-G2 routers may crash. "show log" output of the router can be used to identify the crash :
%DSPRM-3-DSPALARM: Received alarm indication from dsp (0/1). Resetting the DSP.

Conditions:

When maximum ECAN tail length is configured to a value less than 80 ms.

Workaround:

Use default ECAN coverage value of 128ms.

Example :

voice-port 1/0:23
ecan-cancel coverage 128

It also says that it was updated 3 days ago 

Fixed-In Fixed-in

15.1(3.22)T

I can not see this relaese in downlods I can only assume they mean

the latest IOS 15.1.3T3

HTH

Alex

Regards, Alex. Please rate useful posts.
4 REPLIES
Green

Cisco 2911 PRI dropping calls! Help!

Hi,

This is what the bug you are hitting says

CSCtj71414 Bug Details
DSP crash in ecan when max tail delay configured is 32ms
Symptom:

PVDM3 DSP in ISR-G2 routers may crash. "show log" output of the router can be used to identify the crash :
%DSPRM-3-DSPALARM: Received alarm indication from dsp (0/1). Resetting the DSP.

Conditions:

When maximum ECAN tail length is configured to a value less than 80 ms.

Workaround:

Use default ECAN coverage value of 128ms.

Example :

voice-port 1/0:23
ecan-cancel coverage 128

It also says that it was updated 3 days ago 

Fixed-In Fixed-in

15.1(3.22)T

I can not see this relaese in downlods I can only assume they mean

the latest IOS 15.1.3T3

HTH

Alex

Regards, Alex. Please rate useful posts.
New Member

Cisco 2911 PRI dropping calls! Help!

Yes that is the bug.......I see the latest IOS for the 2911 is the15.2(2)T. Can I not use this?

Green

Cisco 2911 PRI dropping calls! Help!

Hi,

Yes I would always use the latest IOS.

If you end up raising a TAC they like you to have the latest version installed.

Regards

Alex

Please rate useful posts

Regards, Alex. Please rate useful posts.
New Member

Cisco 2911 PRI dropping calls! Help!

Thanks Alex. I will perform the upgrade and see how it goes. So you don't think I have to buy the EC-MFT-64 to get this thing to work?

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