configuration for retries of SIP Registration failover
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When SIP response 408/503/500 is received for SIP Register requests to all server addresses, the failover retry will be scheduled with certain time interval.
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If number of continuous failed retries reached 'failover_max_retries', the SIP registraion will be given up. By default, the number is '-1', i.e. unlimited.
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'failover_interval1' is used between normal failover retries, which is 10 seconds by default.
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'failover_interval2' is used once after every 3 continuous retries, which is 60 seconds by default.