27
R20A
Admin Guide
Multicast codec
：
Go to
Phone
-
Call Feature
to configure
multicast related codec.
4.2.5.Session Timer
Go to
Account
-
Advanced
to configure.
If enabled, the on going call will be disconnected automatically once
the session expired unless it’s been refreshed by UAC or UAS.
4.2.6.Encryption
Go to the path
Account - Advanced
If enabled, voice will be
encrypted.
4.2.7.NAT
Go to
Account
-
Advanced
to display NAT related settings.
UDP Keep Alive message:
If enabled, IP phone will send UDP
keep-alive message periodically to router to keep NAT port alive.
Figure 4.2.5 Session timer
Figure 4.2.6 Encryption
Figure 4.2.7 NAT
