Yealink SIP-T2XP, Руководство администратора

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Configuring Advanced Features
67
The following figure illustrates the IP phone is able to failover to an alternate server
when there is no response to a REGISTER request.
Procedure
DNS SRV query can be configured using the configuration files or locally.
Configuration File <MAC>.cfg
Configure the DNS SRV query
on the IP phone.
For more information, refer to
Server Redundancy on page
152 .
Local Web User Interface
Configure the DNS SRV query
on the IP phone.
Navigate to:
http://<phoneIPAddress>/cgi-bi
n/ConfigManApp.com?Id=4
To configure the DNS SRV query via web user interface:
1. Click on Account.
2. Select the desired account from the pull-down list of Account.
3. Select DNS-SRV from the pull-down list of the Transport.
4. Click Confirm to save the change.
Network Address Translation (NAT) is essentially a translation table that maps public IP
address and port combinations to private IP address and port combinations. This
reduces the need for a large amount of public IP addresses. The NAT feature helps
ensure security since each outgoing or incoming request must go through a translation
process, it also offers the opportunity to qualify or authenticate the request or match it to
a previous request. But in the VoIP environment, NAT translation may break end-to-end
connectivity.