Chapter 11 Voice
11.6 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 92 SIP > QoS
Each field is described in the following table.
Table 55 SIP > QoS
LABEL | DESCRIPTION |
SIP TOS Priority | Enter the priority for SIP voice transmissions. The ZyXEL Device creates Type of |
Setting | Service priority tags with this priority to voice traffic that it transmits. |
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RTP TOS Priority | Enter the priority for RTP voice transmissions. The ZyXEL Device creates Type of |
Setting | Service priority tags with this priority to RTP traffic that it transmits. |
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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. |
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Apply | Click this to save your changes and to apply them to the ZyXEL Device. |
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Cancel | Click this to set every field in this screen to its |
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11.7 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.
11.7.1 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.
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