AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 193)

4-30 41-001343-01 Rev 03, Release 3.2.2
Advanced Network Settings
You can set advanced network settings on the IP phone such as, Network Address Translation
(NAT), Network Time Protocol (NTP) Time Servers, Virtual LAN (VLAN), and Quality of
Service (QoS) using the Aastra Web UI or the configuration files.
Network Address Translation (NAT)
The protocols used by all IP phones do not interoperate completely with Network Address
Translation (NAT). For the IP Phones, specific configuration parameters allow the phone to
operate while connected to a network device that enforces NAT. The following is a sample
network using a NAT proxy and relevant IP phone configuration parameters.
SBC or ALG proxy/registrar
The phone at IP address 10.10.10.20 is configured to register with the proxy at 63.251.195.20.
Because the proxy/registrar has session border control (SBC) or application layer gateway
(ALG) functionality, no additional IP phone configuration is required.
Note: The available advanced network parameters via the IP phone UI
are NAT, VLAN, and QoS only.