[cisco-voip] SRST Issue: Phones in Fallback Mode do have a different configuration than when registered to CUCM

[Hans Walter]

Hello Adam,

Thank you very much for the Response,

To answer your question:

No i do not have configured them manually as ephones.

When the problem phones are in SRST Mode and i do a "show
call-manager-fallback" I can see that the wrong configuration is
applied to some ephones. But this Information in the show output is
gone as soon as the IP Phones are registered to the CUCM again.

If you need some specific output or additional information just let me know.

Thanks for your time

Regards,
Hans

Am Dienstag, 12. April 2011 schrieb Adam Frankel (afrankel)
<afrankel at cisco.com>:
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>     Hans,
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>         Do you have the problem phones configured as ephones?
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>         Regards,
>
>       Adam
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>
>         ------------Original Message--------------
>         From: Hans Walter <chrisw1207 at googlemail.com> <chrisw1207 at googlemail.com>
>         Sent: Tue, Apr 12, 2011 10:50:49 Am
>         To: cisco-voip at puck.nether.net
>         CC:
>         Subject: [cisco-voip] SRST Issue: Phones in Fallback Mode do
>         have a different configuration than when registered to CUCM
>       Hi List Members,
>
>
>         I do have a strange Problem in regards to SRST and i am running
>         out of ideas what is causing the issue.
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>         I have installed a CUCM 7.1.3-2000 in my Lab Environment for
>         Study purposes with several IP Phones registered to it and a
>         2821 ISR Router with c2800nm-ipvoicek9-mz.124-24.T.bin.
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>         After reading up how SRST works and how it is configured, i
>         started immediately to test it out.
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>         I have the following, SRST related, configuration on the 2811
>         Router.
>
>          call-manager-fallback
>          max-conferences 8 gain -6
>          transfer-system full-consult
>          limit-dn 7960 2
>          ip source-address 172.16.7.254 port 2000
>          max-ephones 58
>          max-dn 192
>          keepalive 20
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>         The Feature itself is working like a charm. As soon as the
>         connection to the CUCM is gone, the IP Phones go in the Fallback
>         Mode and register with the SRST Gateway.
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>         Now here is the strange thing i do not understand.
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>         As soon as this happens the Phones have a complete different
>         configuration (e.g. the DN) as when they are registered to the
>         CUCM.
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>         As far as i understand, the IP Phones store the last
>         configuration in Flash memory, and when they register with the
>         SRST Gateway, the Gateways retrieves the configuration from the
>         phones.
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>         Now why do they have a complete different configuration?
>         Shouldn't the configuration, which is active when registered to
>         the CUCM, stored as "last configuration" ?
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>         The configuration in SRST Mode is the configuration of a
>         colleague of mine, which had a lab before i got the telephones.
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>         This behaviour does not occur on all IP Phones. 2 7960 work like
>         i would it have expected, they go in Fallback Mode and nothing
>         changes.
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>         All other IP Phones behave like mentioned above.
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>         I have tried to do a Hardware Reset (plug the cable and put back
>         in with the # pushed), but this only solved the issue partially.
>         Now when they go in SRST Mode they have no configuration at all.
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>         The 7960 have P00308010100 as App Load ID and Version 8.1(1.0).
>         These 7960 are the ones which work without problems.
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>         The 7962 have SCCP42.8-5-2SR1S and SCCP41.8-5-2SR1S and the 7911
>         has SCCP 11.8-5-2SR1S and all do not behave like expected.
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>         So how can i fix this issue and what is causing it?
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>         Sorry for the wall of text, i am quite new to the whole Voice
>         World.
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>         I hope a provided all information which are needed. If you need
>         additional information, don't hesitate.
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>         Thanks in advance for your time and help
>
>         Cheers,
>         Chris
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