Yealink T5 Series, Administrator'S Manual

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Administrator’s Guide for SIP-T58V/T58A/T56A/CP960 IP Phones
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Static DNS Cache Configuration
Behave with a Configured DNS Server
When the phone is configured with a DNS server, it will behave as follows to resolve the domain name of the server:
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The phone performs a DNS query to resolve the domain name from the DNS server.
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If the DNS query returns no results for the domain name, or the returned record cannot be contacted, the values in
the static DNS cache (if configured) are used when their configured time intervals are not elapsed.
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If the configured time interval is elapsed, the phone will attempt to perform a DNS query again.
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If the DNS query returns a result, the phone will use the returned record from the DNS server and ignore the stat-
ically configured cache values.
When the phone is not configured with a DNS server, it will behave as follows:
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The phone attempts to resolve the domain name within the static DNS cache.
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The phone will always use the results returned from the static DNS cache.
Static DNS Cache Configuration
The following table lists the parameters you can use to configure static DNS cache.
Parameter
account.X.dns_cache_type
[1]
<MAC>.cfg
Description
It configures whether the phone uses the DNS cache for domain name resolution of the SIP server and
caches the additional DNS records.
Permitted
Values
0 -Perform real-time DNS query rather than using DNS cache.
1 -Use DNS cache, but do not record the additional records.
2 -Use DNS cache and cache the additional DNS records.
Default 1
Parameter
account.X.static_cache_pri
[1]
<MAC>.cfg
Description
It configures whether preferentially to use the static DNS cache for domain name resolution of the SIP
server.
Permitted
Values
0 -Use domain name resolution from server preferentially
1 -Use static DNS cache preferentially
Default 0
Parameter
dns_cache_naptr.X.name
[2]
<y0000000000xx>.cfg
Description It configures the domain name to which NAPTR record X refers.
Permitted
Values
Domain name
Default Blank
Parameter
dns_cache_naptr.X.order
[2]
<y0000000000xx>.cfg
Description
It configures the order of NAPTR record X.
NAPTR record with the lower order is more preferred.
Permitted
Values
Integer from 0 to 65535