IP Telephony and Phones

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Hello Everyone, We have  CUC integrated with CUCM using SCCP. We plan to move from SCCP to SIP. What would be the best strategy to accomplish this task with minimum downtime. Please note that the availability of voice mail is crucial for our business...

mightyking by Level 6
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I am having issues with one of our sites that is setup with a cisco 2921 that has 4 POTS lines in a hunt connected to FXO ports on the gateway.  Local calls complete fine but when dialing long distance I get the message "we're sorry your call cannot ...