VoIP Device Behind Vigor Router
Posted by on 25 January 2012 04:30 PM
Q. Can I use a VoIP or SIP device if I don't have a VoIP model Router?
You certainly can! There are two techniques which can be used, and your DrayTek router supports both of them...
STUN server method is much simpler, but requires that your VoIP device supports use of a STUN server. See your VoIP device's instructions for details on how to configure for a STUN server. One free STUN server is "stun.fwdnet.net".
Open Ports method requires you to open TCP port 5060 (for SIP communication), and possibly a range of UDP ports (for RTP). Please see the instructions for Opening / Forwarding Ports.
Q. Can I have more than one VoIP Device?
If you are using the Open Ports method, you can only have port 5060 forwarded to one LAN device. You can use a different public port (e.g. 5061) forwarded to an additional VoIP device - but this will require that your VoIP Provider's SIP server accepts non-standard ports.
The STUN Server method supports multiple VoIP devices on your LAN. All can be working independently.
Q. How to configure my DrayTek Vigor router to use VoIP ?
The latest firmware for Vigor routers support STUN. If your VOIP device supports STUN, then there is no change required to the router configuration.
If your VoIP device does not support STUN server, you will need to Open or Redirect the SIP port, and enable QoS (Quality of Service).
Step 1: Open or Redirect the SIP Port .
Note: If your DrayTek Vigor router is a 'V' model (i.e. has built-in VoIP FXS ports) then the built-in ports will also use SIP port 5060 by default, and will have priority over external devices using the same port. You will need to use different SIP Port for each device.
You can use either "NAT > Port Redirection" or "NAT > Open Ports" on your DrayTek router. For an explanation of the differences, please see What are the differences between Port Mapping, Open Ports and DMZ ? The example shown below uses the “Open Ports” method.