Yealink SIP-T21 E2 Administrator's Guide

Configuring Advanced Features
765
Parameter
Description
Port
Identify the port number to be used.
Target
Identify the actual host for an A query.
SRV query returns two records. The two SRV records point to different hosts and have the same
priority 0. The weight of the second record is higher than the first one, so the second record
will be picked first. The two records also contain a port “5060”, the IP phone uses this port. If
the Target is not a numeric IP address, the IP phone performs an A query. So in this case, the IP
phone uses “server1.yealink.pbx.com" and “server2.yealink.pbx.com" for the A query.
A (Host IP Address)
The IP phone performs an A query for the IP address of each target host name. Example of A
records:
Server1.yealink.pbx.com IN A 192.168.1.13
Server2.yealink.pbx.com IN A 192.168.1.14
The IP phone picks the IP address “192.168.1.14” first.
Procedure
SIP Server Domain Name Resolution can be configured using the following methods.
Central Provisioning
(Configuration File)
<MAC>.cfg
Configure the transport method on the IP
phone.
Parameters:
account.X.sip_server.Y.transport_type
account.X.naptr_build
Web User Interface
Configure the transport type on the IP
phone.
Navigate to:
http://<phoneIPAddress>/servlet?p=acco
unt-register&q=load&acc=0
Details of Configuration Parameters:
Parameters
Permitted Values
Default
account.X.sip_server.Y.transport_type
(X ranges from 1 to 16, Y ranges from 1 to 2)
0, 1, 2 or 3
0
Description:
Configures the transport method the IP phone uses to communicate with the SIP server
for account X.

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English