Using manual configuration
This method requires configuration of the user and extension entries in the system configuration before connecting of the actual phones.
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For non-IP Office Subscription mode systems, check that the system has the appropriate licenses to support both the SIP telephone extensions (Avaya and third-party) and the extension users.
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Enable SIP extension support
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Adjust the system Codecs (Optional)
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Check the system DHCP settings
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Add SIP Users to the configuration
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Add SIP Extensions to the configuration
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Attach the phones