Sophos Firewall VoIP settings optimization

If you have problems with SFOS VoIP, the following settings may help.

1. Disable SIP Helper

The SIP Helper module is enabled by default and can be disabled like this.

Connect to the firewall via SSH and select option 4. Device Console.

Show status of the module

system system_modules show

Disable SIP module

system system_modules sip unload

Enable SIP module

system system_modules sip load

2. Increase UDP session timeout

Some VoIP providers require a higher UDP timeout for the connections. To increase the value, you must also connect to the firewall via SSH and select option 4. Device Console.

Show UDP Timeout Stream Value

show advanced-firewall

UDP timeout stream value on the Sophos Firewall

Adjust UDP timeout stream value

Example: set advanced-firewall udp-timeout-stream
set advanced-firewall udp-timeout-stream 180