Additional Information
13
RN-001037-03 REV19 – 07.2014
Configurable DNS Maximum Cache TTL Settings
Previously, the DNS maximum cache Time To Live (TTL) settings on the phone were
unconfigurable and statically set to 5 minutes. In Release 3.3.1 SP4, Administrators can
manually set the DNS maximum cache TTL settings for both negative and positive
responses on the phone by defining the “
sip dns cache negative max ttl
” and “
sip
dns cache positive max ttl
” parameters in the configuration files. Setting these
parameters will help alleviate issues regarding the phone not considering the DNS
retry time settings defined by the DNS server.
Configuring the DNS Maximum Cache TTL Settings
Use the following parameters to configure the DNS maximum cache TTL settings.
Parameter
–
sip dns cache negative max ttl
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description
Specifies the DNS maximum cache TTL for negative responses.
Format
Integer
Default Value
-1 (5 minutes)
Range
0 - 2147483647 (seconds)
(0 = Disabled)
Example
sip dns cache negative max ttl: 3600
Parameter
–
sip dns cache positive max ttl
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description
Specifies the DNS maximum cache TTL for positive responses.
Format
Integer
Default Value
-1 (5 minutes)
Range
0 - 2147483647 (seconds)
(0 = Disabled)
Example
sip dns cache positive max ttl: 3600
