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The SIP realtime objects are users and peers that are loaded in memory when needed, then deleted. This means that Asterisk currently can't handle voicemail notification and NAT keepalives for these peers. Other than that, most of the functionality works the same way for realtime friends as for the ones in static configuration.
With caching, the device stays in memory for a specified time. More information about this is to be found in the sip.conf sample file.
If you specify a separate family called "sipregs" SIP registration data will be stored in that table and not in the "sippeers" table.