[asterisk-users] load balancing

[Ron]

Hi All,

If i have this kind of setup, what do i need to make it's load balance.

[ asterisk 1 ] -- [ asterisk 2 ] -- [ asterisk 3 ] -- [ asterisk 4 ]
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I plan on doing it via DNS SRV only, but if a user register on asterisk 
1 how can users at asterisk 4 reach that user. Thank You

Regards,
Ron