ZyXEL Communications P-2802H-I Series, User Manual

Page: 141 / 418

Chapter 10 Voice
P-2802H(W)(L)-I Series User’s Guide
141
10.6 SIP QoS Screen
Use this screen to maintain ToS and VLAN settings for the ZyXEL Device. To access this
screen, click
VoIP > SIP > QoS .
Figure 77 SIP > QoS
Each field is described in the following table.
10.7 Phone
You can configure the volume, echo cancellation and VAD settings for each individual phone
port on the ZyXEL Device. You can also select which SIP account to use for making outgoing
calls.
10.7.1 Voice Activity Detection/Silence Suppression
Voice Activity Detection (VAD) detects whether or not speech is present. This lets the ZyXEL
Device reduce the bandwidth that a call uses by not transmitting “silent packets” when you are
not speaking.
Table 50 SIP > QoS
LABEL DESCRIPTION
SIP TOS Priority
Setting
Enter the priority for SIP voice transmissions. The ZyXEL Device creates Type of
Service priority tags with this priority to voice traffic that it transmits.
RTP TOS Priority
Setting
Enter the priority for RTP voice transmissions. The ZyXEL Device creates Type of
Service priority tags with this priority to RTP traffic that it transmits.
Voice VLAN ID Select this if the ZyXEL Device has to be a member of a VLAN to communicate
with the SIP server. Ask your network administrator, if you are not sure. Enter the
VLAN ID provided by your network administrator in the field on the right. Your LAN
and gateway must be configured to use VLAN tags.
Otherwise, clear this field.
Apply Click this to save your changes and to apply them to the ZyXEL Device.
Cancel Click this to set every field in this screen to its last-saved value.