User's Manual

Default names
Default
names can also be provisioned in the Device Configuration file if per-user files are not
required. Default names are overridden by names specified in the user.cfg file.
• DEFAULT_ADDRESSBOOK_FILE
• DEFAUT_SPEEDDIAL_LIST
• DEFAUT_CUSTOMKEYS_FILE
For more information about the Device Configuration file, see
Feature configuration
commands on page 55.
SIP Domain DNS Lookup feature
The DNS Lookup feature enables the IP Deskphone to discover IP addresses for a specified
SIP domain using DNS.
There are two ways the DNS Lookup feature can provide SIP domain IP addresses to the IP
Deskphone:
1.
using DNS SRV records (refer to RFC2782)
2. using DNS A/AAAA records (IPv4/IPv6 address records)
How DNS lookup works
One
or two IP addresses can be configured for a particular SIP domain - primary and secondary
IP addresses:
• SERVER_IP[x]_1
• SERVER_IP[x]_2
where x = the domain number from 1 to 5.
If the IP Deskphone attempts to log on using these configured addresses and fails to do so,
the IP Deskphone then tries to discover the IP addresses using DNS. If there is no primary or
secondary SIP domain IP address configured, then the IP Deskphone uses DNS to determine
the IP address. If only SERVER_IP[x]_2 is configured (SERVER_IP[x]_1 is 0.0.0.0), then DNS
Lookup is used first; if DNS Lookup fails, only then is the secondary IP address tried.
The DNS Lookup feature tries to obtain SIP domain IP addresses through DNS SRV records,
using the domain name as a parameter for UDP, TCP, and TLS. Multiple SRV records can be
configured for each domain and for each transport protocol (UDP, TCP and TLS). The
Features
184 SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013
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