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Telephone Backup plan

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Last Modified: 2015-10-15
I have T1 line with more than 400 DIDs. We use cisco CUCM to manage calls. Unfortunately we T1 line is not working and some major problem in ATT side and will take few days to come backup. We have no calls coming in and out for few days now. What is the quick alternative solution is this scenario to make all lines work?.
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