Vigor2925 Series User’s Guide
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This page allows you to enable/disable VoIP, set secure phone, NAT Traversal Setting and
RTP for the VoIP function.
Available settings are explained as follows:
Item Description
Secure Phone
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.
NAT Traversal Setting
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.
RTP
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
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