VTech ET685 Administrator And Provisioning Manual page 351

Description:
Values:
Default:
Setting:
Description:
Values:
Default:
Configuration File Parameter Guide
ET685 Administrator and Provisioning Manual
Enables/Disables the status polling of primary SBC's if the phone has been
failed over to the backup SBC's.
Not recommended due to additional traffic.
If enabled the phone will send Option Requests within the
account_health_check to the primary SBC. Any SIP Response will be
taken as host is available again and the entry will then change to
quarantine state. If the quarantine period timer finally fires, it will trigger a
reregistration of all accounts to the primary SBC again.
The following settings configure the timing and show their default values
(all in seconds):
sip_health_check: off // en/disables the health check
sip_health_check_base_time: 30
sip_health_check_max_time: 300
sip_health_check_static_time: 300
The value of dirty_host_ttl needs to be chosen "large enough", lets say a
couple of hours or something similiar. The SIP Options resend time is then
calculated as
health_check_ubw = min(health_check_max_time, base_time *
2^num_retries)
health_check_ubw *= rand(50..100%)
health_check_ubw += health_check_static_time
The same algorithm is used for the quarantine_period of the primary SBC,
except that the static and max times are adjustable:
sip_quarantine_max_time: 600
sip_quarantine_static_time: 1800
on, off
off
sip_health_check_base_time
See setting sip_health_check.
positive integer
30
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