Draytek Vigor2862 Series User Manual page 343

NAT Traversal Setting
RTP
IP Call
A A p p p p l l i i c c a a t t
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.
2. Even no voice prompt, but the RTP traffic is still secured until the call ends.
Vigor2862 Series User's Guide
i i o o n n f f o o r r S S e e c c u u r r e e P P h h o o n n e e
STUN Server - Type in the IP address or domain of the STUN
server.
External IP - Type in the gateway IP address.
SIP PING interval - The default value is 150 (sec). It is useful
for a Nortel server NAT Traversal Support.
Symmetric RTP – Check this box to invoke the function. To
make the data transmission going through on both ends of
local router and remote router not misleading due to IP lost
(for example, sending data from the public IP of remote
router to the private IP of local router), you can check this
box to solve this problem.
Dynamic RTP Port Start - Specifies the start port for RTP
stream. The default value is 10050.
Dynamic RTP Port End - Specifies the end port for RTP
stream. The default value is 15000.
RTP TOS – It decides the level of VoIP package. Use the drop
down list to choose any one of them.
Enable IP Call – It allows that a user could dial outgoing IP
Calls; and Vigor router could receive the incoming IP Calls.
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