Draytek Vigor2920n User's Guide download pdf (Page 77)

Vigor2920 Series User’s Guide

available bandwidth, but Vigor V models also equip with automatic QoS assurance.

QoS Assurance assists to assign high priority to voice traffic via Internet. You will

always have the required inbound and outbound bandwidth that is prioritized exclusively

for Voice traffic over Internet but you just get your data a little slower and it is tolerable

for data traffic.

This page allows you to set phone book and digit map for the VoIP function. Click the Phone

Book and Digit Map links on the page to access into next pages for dialplan settings.

Enable Secure Phone It allows users to have encrypted RTP stream with the peer side

using the same protocol (ZRTP+SRTP). Check this box to have

secure call.

Enable SAS Voice Prompt If it is enabled, SAS prompt will be heard for both ends every

time. If it is disabled, no SAS prompt will be heard any more.

Enable SAS Voice Prompt, for ex: if vigor router A calls vigor router B with checking Enable

Secure Phone and Enable SAS Voice Prompt, then:

1. After the connection established, vigor router A will send SAS voice prompt to A and

vigor router B will send the SAS voice prompt to B.

2. Then the RTP traffic is secured until the call ends.

3. If vigor router A wants to call vigor router B again next time, both A and B will not hear

any voice prompt again even checking Enable SAS Voice Prompt on web UI. It means

only the first call between them will have voice prompt.

Enable SAS Voice Prompt, for ex: if vigor router A calls vigor router B with checking Enable

Secure Phone but not Enable SAS Voice Prompt, then:

1. After the connection established, vigor router A will NOT send SAS voice prompt to

vigor router A and vigor router B will NOT send the SAS voice prompt to vigor router B.

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Draytek Vigor2920n User's Guide Page 77