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ONFIGURING THE PHONE
host name has to be used which will match the MX-ONE server certificate
CN=*.<mxone- domain>.
Here is an example using TLS and DNS SRV Record configured in
aastra.cfg/startup.cfg:
sip transport protocol:4 #1-UDP 2-TCP 4-TLS
sips persistent tls:1
sips trusted certificates:”ca.pem”
sip outbound proxy: mx.example.net
sip outbound proxy port: 0
sip proxy ip: mx.example.net
sip proxy port: 0
sip registrar ip: mx.example.net
sip registrar port: 0
sip dns srv1 name: _sip_tls.mx.example.net
sip dns srv1 priority: 10
sip dns srv1 weight: 50
sip dns srv1 port: 5061
sip dns srv1 target: lim1.mx.example.net
sip dns srv2 name: _sip_tls.mx.example.net
sip dns srv2 priority: 10
sip dns srv2 weight: 50
sip dns srv2 port: 5061
sip dns srv2 target: lim2.mx.example.net
sip dns srv3 name: _sip_tls.example.com
sip dns srv3 priority: 20
sip dns srv3 weight: 60
sip dns srv3 port: 5061
sip dns srv3 target: lim1.mx.branch-office.example.net
sip dns host file: hostfile.txt
hostfile.txt content:
192.168.0.1 lim1.mx.example.net
192.168.0.2 lim2.mx.example.net
192.168.8.1 lim1.mx.branch-office.example.net
In the example, the phone will first use the DNS SRV record with lowest priority value,
that is record #1 or #2 both with 50 percentage probability, which means that the phone
will register towards server 1 or server 2.If record #1 or #2 are not available it will try
record #3 which is next in priority.
MX-ONE must be able to resolve the host name of the record targets,
limX.mx.corp.net. Either the DNS server offered to the phone in the DHCP will resolve
an A query or this DNS is configured to redirect the A query to the DNS server on lim1.
Alternatively, as in this example, hostfile.txt is used to translate host name to IP
address. This file shall be available on the SW server together with the
aastra.cfg/startup.cfg file. The host file is downloaded to the phone at restart.
When the telephone is registered towards the backup registrar and when the user initi-
ates a call, the INVITE will be sent to the primary registrar first, which causes a delay
of the call with 3-4 seconds. The telephone will discover when the primary registrar is
working again and register towards this one.
There are some limitations when the telephone is registered towards the backup regis-
trar, see 11.28.1 Limitations on page 53.
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