Aastra 9000i Series Administrator's Manual page 679

If all three servers with priority 10 are unavailable, the next highest priority record is selected, in
this case backupbox. This could be a server in another physical location.
The server entries in the aastra.cfg file can use DNS hostnames or can use IP addresses. If
hostnames are used, any pre-cached DNS A records via the host file mechanism are used before
resorting to live DNS query if there is no local match.
For example, the following hostfile.text uses IP addresses that are used in the DNS server
queries:
hostfile.txt
192.168.2.3 bigbox.example.com
192.168.3.4 smallbox1.example.com
192.168.8.1 smallbox2.example.com
47.28.05.69 backupbox.example.com
Use the following procedure in the configuration files to configure DNS server query support for
the phones.
Configuration Files
For the specific parameter you can set in the configuration files, see Appendix A, the section,
Query" on page A-249.
Use the following procedure to configure DNS SRV record pre-caching..
Configuring DNS SRV Record Pre-caching
1 Using a text-based editing application, open the aastra.cfg file.
2 Enter the parameter, "sip dns srvX name", where "X" is a value from 1 to 4.
Enter a value for the DNS SRV service URI. For example:
sip dns srv1 name: _sip._udp.example.com
3 Enter the parameter, "sip dnx srvX priority, where "X" is a value from 1 to 4.
Enter a value for the DNS server priority. Valid values are 0 to 65535. Default is 0. For example:
sip dns srv1 priority: 10
After this parameter is downloaded from the configuration server to the phone, the phone uses the
DNS server with the lowest numbered priority first to perform DNS lookups.
4 Enter the parameter, "sip dnx srvX weight, where "X" is a value from 1 to 4.
Enter a value for the DNS server weight. Valid values are 0 to 65535. Default is 0. For example:
sip dns srv1 weight: 60
Note: The "sip dns srv1 weight" parameter must be configured but will be supported in a future
release.
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"DNS Server
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