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Overview:
The IMG at certain times needs to be taken out of service for maintenance or to upgrade software. The Graceful Shutdown feature gives the IMG the ability to gracefully divert traffic away before performing these tasks. This feature gives the IMG the ability to take any or all configured channels within the system out of service (OOS) without disconnecting active calls. Connected Channels with active calls on them will not be taken out of service until the calls have been released. Once the channel has been torn down it is returned to the idle state then the channel is taken out of service. The Graceful OOS can be used in two ways.
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