How?
This help page provides essential configuration guidance for Draytek routers to ensure optimal VoIP performance with the Voys platform, addressing common compatibility issues that can affect call quality and connectivity.
Introduction
There are many different types of Draytek routers on the market. If you want to use a Draytek router, pay attention to the points below
Settings
Note: Some features are not available in all models
Firmware
Make sure the router has the latest stable firmware. You can find how to do this on the manufacturer's website.
Hardware NAT
In older models, this function can be disabled. This function can be found under [NAT] and then [Hardware NAT]. Turn this function off.
Strict Firewall
This function can block SIP traffic. Under [Firewall] [General setup] you can uncheck the box next to [Enable Strict Security Firewall]
Filtering
Sometimes one-way audio when making outgoing calls. Under [Firewall] [General setup] Call Filter and Data Filter both set to disable
SIP ALG
Disabling SIP ALG on a Draytek router
For the models: Vigor2750, Vigor2130
SIP ALG is enabled by default. If you want to turn this off:
- Make sure the computer is connected to the router.
- Open a command line;
- Windows: Start -> Run -> type cmd -> enter
- OS X: CMD+space -> type terminal -> enter
- In this command line type telnet *IP-of-the-router* and press enter
- Type the username of the modem and press enter
- Enter the password of the modem and press enter again
- Enter the following and press enter:
kmodule_ctl nf_conntrack_sip disable - Enter the following and press enter:
kmodule_ctl nf_nat_sip disable - Once the modem has restarted, you can test if VoIP works.
All other models
- Make sure the computer is connected to the router.
- Open a command line;
- Windows: Start -> Run -> type cmd -> enter
- OS X: CMD+space -> type terminal -> enter
- In this command line type telnet *IP-of-the-router* and press enter
- Type the username of the modem and press enter
- Enter the password of the modem and press enter again
- Enter the following and press enter:
sys sip_alg 0 - Once the modem has restarted, you can test if VoIP works.
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