VG 224 SCCP SRST Fall Back

Unanswered Question
Apr 19th, 2007
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We want to do SRST on VG 224. i did that configuration on VG,

sccp local FastEthernet0/0

sccp ccm identifier 10 (CCM)

sccp ccm identifier 20 (SRST Router)

sccp ccm group 1

associate ccm 10 priority 1

associate ccm 20 priority 2

switchback method graceful

It is working with CCM but when we shut connection with CCM, SRST is not working. I mean VG 224 didnt associate to Router. There is no configuration lines on router about SCCP or SRST.

Can anyone help for that problem?


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Aaron Harrison Thu, 04/19/2007 - 04:34
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Do you mean by 'There is no configuration lines on router about SCCP or SRST. ' that you haven't configured the router for SRST? I.e. you haven't any config starting 'call-manager-fallback'?

If so, you can't really expect it to work yet :-)

If you can post your router config and sh ver we can review...


Please rate helpful posts...

yatisengineer Thu, 04/19/2007 - 05:03
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Hi just did that on router,


secondary-dialtone 0

max-conferences 8 gain -6

transfer-system full-consult

ip source-address port 2000 /CCM

max-ephones 24

max-dn 24

but i m taking a message from router like;

%SKINNYSERVER-3-NOINIT: Can't initialize Skinny server

sh ver

Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version 12.4(13), RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2007 by Cisco Systems, Inc.

Compiled Thu 22-Feb-07 15:38 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

itfaiye_egtm uptime is 1 week, 1 day, 2 hours, 1 minute

System returned to ROM by power-on

System image file is "flash:c2800nm-adventerprisek9-mz.124-13.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

[email protected].

Cisco 2821 (revision 53.51) with 247808K/14336K bytes of memory.

Processor board ID FCZ1104714Q

1 DSL controller

2 Gigabit Ethernet interfaces

1 ATM interface

1 Virtual Private Network (VPN) Module

8 Voice FXO interfaces

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102


yatisengineer Fri, 04/20/2007 - 06:24
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Thanks for your replies,

i did that configuration,

stcapp ccm-group 1


sccp local FastEthernet0/0

sccp ccm identifier 1 / CCM 1

sccp ccm identifier 2 / CCM 2

sccp ccm identifier 3 /CCM 3

sccp ccm identifier 4 / router (SRST


sccp ccm group 1

associate ccm 1 priority 1

associate ccm 2 priority 2

associate ccm 3 priority 3

associate ccm 4 priority 4

switchback method graceful

dial-peer voice 6300 pots

service stcapp

port 2/0

Normally SCCP is working with CCMs but when i close the connection with CCMs, VG did not associate with router. I did SRST configuration on router but it is not working.

Thank you.

andres.pasten Mon, 12/29/2008 - 14:42
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I've a similar problem, but it's the delay of the vg224 to register their ports with the SRST router.

Normally Ip phones register with SRST router in less than 2 minutes, but VG224 ports register in 10 or more minutes. That's normal?

Please let me know.

Andres Pasten C.

Adexus S.A.

Cisco Rath! Tue, 07/07/2009 - 02:07
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Hi Team,

I also have the same problem. Infact its quiet less compared to Andres issue. In my case, VG 224 fallback to SRST takes around 3 minutes. But IP Phones are quiet fast. Can we reduce the fallback time of VG224 bcoz customer is more specific on less time?

pls advice

Ratheesh Kumar

vincent.morton Thu, 04/25/2013 - 04:26
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Did anyone ever get an answer to this issue?

We have a customer with a mix of IP phones and VG224s configured as SCCP.

In the event of WAN failure, the IP phones fail over to SRST within 2 minutes but the VG224's take about 5 minutes. Is there any way to reduce the time it takes a VG224 to fail over to SRST?

Carlos Campos Thu, 05/23/2013 - 06:19
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I think that you need to put the following command :

sccp ccm group 1

associate ccm 1 priority 1

associate ccm 2 priority 2

associate ccm 3 priority 3

associate ccm 4 priority 4

switchover method graceful

switchback method graceful

If you need more information, please read :


Carlos Campos

vincent.morton Fri, 06/28/2013 - 04:30
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Carlos, thanks for your reply but that's how they're already configured. The only alternative I've been able to find is switchover method immediate but it's not supported.

The issue is that it takes far longer for the VG224s to failover than the IP phones so when they have an outage, they can't phone between analog and IP phones on the same site.

Does anyone know how to reduce the time between loss of connectivity between a VG224 and CUCMs and registration with their SRST gateway?


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