Draytek Vigor 2130 Series, User Manual, Page: 271 / 353

Vigor2130 Series User’s Guide 261
Also, you can specify each field for your necessity. It is
recommended for you to use the default settings for VoIP
communication.
Caller ID Type – Display IP type of the caller.
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
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.