Aastra 6700i Installation Instructions Manual page 57

11.22
26/1531-ANF 901 14 Uen E10 2014-01-22
Using DNS SRV Resource Records
DNS SRV resource records can be used to implement more alternatives
for redundancy than just sip proxy and sip backup proxy. This feature
can also be used when a local branch office sip proxy shall be used.
DNS SRV records can be defined in the DNS server or in the aastra.cfg
file.
The phone performs an SRV lockup when the IP address of the server
is a fully qualified domain name (FQDN) and the corresponding port is
set to 0.
Here is an example when using aastra.cfg:
sip proxy ip: 192.168.0.1
sip proxy port: 5060
sip registrar ip: 0.0.0.0
sip registrar port: 5060
sip backup proxy ip: example.com
sip backup proxy port: 0
sip backup registrar ip: example.com
sip backup registrar port: 0
sip dns srv1 name: _sip_udp.example.com
sip dns srv1 priority: 10
sip dns srv1 weight: 50
sip dns srv1 port: 5060
sip dns srv1 target: mx-one-server2.example.com
sip dns srv2 name: _sip_udp.example.com
sip dns srv2 priority: 10
sip dns srv2 weight: 50
sip dns srv2 port: 5060
sip dns srv2 target: mx-one-server3.example.com
sip dns srv3 name: _sip_udp.example.com
sip dns srv3 priority: 20
sip dns srv3 weight: 60
sip dns srv3 port: 5060
sip dns srv3 target: branch-office-server.example.com
hostfile.txt
192.168.0.2 mx-one-server2.example.com
192.168.0.3 mx-one-server3.example.com
192.168.8.1 branch-office-server.example.com
In the example MX-ONE has ordered the phone to register in MX-ONE
server 1 as primary registrar. If server 1 is not available, the phone will
use the DNS SRV record with lowest priority, that is record #1 or #2 both
with 50 percentage probability, which means that the phone will register
towards server 2 or server 3.
MX-ONE must know the IP domain name, that is example.com above.
If all MX-ONE servers are unavailable, the phone will use record #3 and
register towards the branch office registrar.
C P
ONFIGURING THE HONE
57