Yealink SIP-T2 SERIES Administrator's Manual page 702

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
dns_cache_a.X.ttl
(X ranges from 1 to 12)
Description:
Configures the time interval (in seconds) that A record X may be cached before the
record should be consulted again.
Example:
dns_cache_a.1.ttl = 3600
Web User Interface:
None
Phone User Interface:
None
account.X.dns_cache_type
Description:
Configures whether the IP phone uses the DNS cache for domain name resolution
of the server and caches the additional DNS records for account X.
0-Perform real-time DNS query rather than using DNS cache.
1-Use DNS cache, but do not cache the additional DNS records.
2-Use DNS cache and cache the additional DNS records.
X ranges from 1 to 16 (for SIP VP-T49G/SIP-T48G/T46G/T29G)
X ranges from 1 to 12 (for SIP-T42G)
X ranges from 1 to 6 (for SIP-T41P/T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
Example:
account.1.dns_cache_type = 1
Web User Interface:
None
Phone User Interface:
None
account.X.static_cache_pri
680
Parameters Permitted Values
Integer from 30 to
2147483647
0, 1 or 2
0 or 1
Default
300
1
0