IV. Voice-over-IP (VoIP)

DrayOS F/W 3.8.0 and later

Access the router's web interface and click the Web Console button in the upper right menu:

This will then pop-up the router's Web Console, enter these commands to change the SIP ALG configuration:

• sys sip_alg ? - to check the current status, the default state will have the SIP ALG Disabled
• sys sip_alg 1 - to enable the router's SIP ALG functionality
• sys sip_alg 0 - to disable the SIP ALG if needed.
• sys sip_alg port 5070 - to change the SIP ALG listening port to 5070 (Requires 3.8.0 or later firmware), default listen port is 5060

DrayOS up to F/W 3.7.9

1. On Windows go to the Start menu, select Run and on there type "cmd" and click OK,  or  if  the  Run  option is not present, type "cmd" in the "Start Search" textbox above the Start button and press enter.  Make sure that telnet is enabled in Windows, check this guide if it isn't available. Other operating systems also have an equivalent telnet program or app.
2. Type "telnet 192.168.1.1" (Replace 192.168.1.1 with your own router's IP address if you have changed it)
3. Enter the username of "admin", press enter, then enter the password for the router.
4. Enter "sys sip_alg ?" to check the current status - it should be disabled on a router from factory default settings.
5. To enable SIP ALG, enter "sys sip_alg 1"
6. Enter "sys sip_alg ?" to check the status of SIP ALG, it should now show as enabled. This will take effect immediately.
7. Enter "sys sip_alg 0" to disable the SIP ALG if needed.

Vigor 2960, 3900, 300B

Go to [NAT] > [ALG] on the router, select the SIP ALG tab and on there is an option to Enable SIP ALG, tick that to enable it and click Apply to apply the change: