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SIP SRST - Extension to Extension calling not working

 

Hi ,

I am facing problem during SIP SRST. We are using 2921 CME SRST router and SIP phones are getting registered on router in SRST mode.

But extn to extn calling is not working. I have attached show run of the router.

 

When i executed, below commands, i got error that "unable to access default file".

"application

  service alternate default "

 

Please guide me on this issue.

 

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