Firewalls, ALG, UDP
Firewalls sit between a computer (or local network) and another network (such as the Internet), controlling the incoming and outgoing network traffic.
With a Firewall, the firewall’s rules determine which traffic is allowed through and which isn’t.
Without a firewall, you are unprotected.
A firewall’s primary security function is blocking unsolicited incoming network traffic. Because a Firewall is sitting between two networks, it can analyze all incoming and outgoing network traffic and decide what to do with it. Firewalls can be configured with multiple conditions for certain types of traffic.
For security purposes, a firewall can allow server connections from a specific IP address while blocking all connection requests from elsewhere.
Please be aware that these settings are simple best SIP practices. The Blueface Support Team is not equipped to manage complex firewall queries.
Allow IP Range: 220.127.116.11/24 (Whole Subnet)
Disable SIP ALG
Set UDP Alive Timeout to 200 Seconds.
Set QoS (Quality of Service).
Should you continue to experience difficulty with your call quality, please contact a third party IT firewall.