Yealink SIP-T2 SERIES Administrator's Manual page 696

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Procedure
Static DNS cache can be configured only using the configuration files.
Configuration File
Details of Configuration Parameters:
dns_cache_naptr.X.name
(X ranges from 1 to 12)
Description:
674
<y0000000000xx>.cfg
<MAC>.cfg
Parameters
Configure NAPTR/SRV/A records.
Parameters:
dns_cache_naptr.X.name
dns_cache_naptr.X.flags
dns_cache_naptr.X.order
dns_cache_naptr.X.preference
dns_cache_naptr.X.replace
dns_cache_naptr.X.service
dns_cache_naptr.X.ttl
dns_cache_srv.X.name
dns_cache_srv.X.port
dns_cache_srv.X.priority
dns_cache_srv.X.target
dns_cache_srv.X.weight
dns_cache_srv.X.ttl
dns_cache_a.X.name
dns_cache_a.X.ip
dns_cache_a.X.ttl
Configure the IP phone whether to
cache the additional
DNS records.
Parameter:
account.X.dns_cache_type
Configure the IP phone whether to
use static DNS cache preferentially.
Parameter:
account.X.static_cache_pri
Permitted Values
Domain name
Default
Blank