User's Manual

hostname is returned instead of the IP address. The hostname must point to an address record

(A or AAAA record).

SRV record example:

_sip._tcp.example.com. 86400 IN SRV 0 5 5060 sipserver.example.com

where:

• sip = the desired service

• tcp = the transport protocol

• example.com = the configured domain name

• 5060 = the port to be used

• sipserver.example.com = the SIP proxy to be used (hostname is replaced by the IP

address using A/AAAA records)

The DNS Lookup feature then tries to find the IP address of the SIP domain in A/AAAA records

on the DNS Server. Only the IP address is returned; therefore, default ports are used — 5060

for UDP/TCP and 5061 for TLS.

Important:

the Fail Back to Primary feature is enabled, then DNS lookup is not used. In this case, you

must configure both primary and secondary IP addresses for a domain.

Caution:

DNS servers are not properly configured or do not respond, DNS Lookup can take a long

time until all necessary requests are sent and corresponding timers expire.

Server Profiles

A System Configuration file allows the administrator to specify a list of domains to which the

IP Deskphone can connect. The administrator can specify up to five different SIP domains.

Each SIP domain supports 2 SIP servers: the Primary (S1) and the Secondary (S2). The

System Configuration file contains the SIP server-specific configuration parameters that are

applied to any SIP server specified in the list of SIP domains.

The

Server Profiles option supports two different sets of configuration parameters: one specific

to the Primary SIP server and one specific to the Secondary SIP server. Each server can be

configured separately by updating configuration parameters contained in the System

Configuration file with values taken from the Server Profile configuration file. Server Profile

parameters are always applied on top of the System Configuration file.

The Server Profile file format is similar to the System Configuration file format, excluding the

following configuration parameters:

Server Profiles

SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013 185