ST2030s VoIP Business Phone
ST2030s SIP Administrator Guide v3.0
Page 120 of 308
DNS Query ( Circular Method)
In the new release today, x.67.2, ST20xx have done an improvement on the
mechanism of the DNS Query, which increases the efficiency on the DNS
request.
Current Implementation (up to SG1.66)
For each SIP message sent from the ST20xx to the proxy server, it have to
wait for the IP resolution done on the Pri DNS server. In case of the Pri DNS
failed, after timout, phone will request to the Sec DNS server afterwards.
Once the Pri DNS server resume and with the timeout of Sec DNS server,
phone will request the Pri DNS agina for IP resolution. The mechanism will
lower the processing speed of the call and the response of the phone in case
the Pri DNS down for a long time.
New Implementation (SGx.67.2)
A new parameter “
DNSFB
” is introduced and found in
Common and MAC
configuration files.
If the value of the parameter is
0
, the implmentation is the same as the
original one, like SG x.66.2, which the phone always queries to the Pri DNS
server.
While, if the value of the parameter is
1
, DNS query will be using a circular
method, which the phone always starts with the DNS that has provided the
answer to the previous request. If the DNS fails, then try the other and if the
other answers, then use the other in subsequent requests until this one fails.
and so on.
The parameter is configurable via APS and Telnet.
Feature Activation
A. Via APS
APS in [net] section of both Common and Specific-MAC config files with the
new parameter:
[net]
DNSFLG=1
DNSFB=0
DSCPflag=0
ESWITCH_LAN=1
ESWITCH_PC=1
Summary of Contents for ST 2030 SIP
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