What Is SIP ALG?
SIP ALG (Session Initiation Protocol Application Layer Gateway) is a network feature found in many routers that modifies VoIP traffic to assist with NAT traversal. While intended to improve VoIP performance, SIP ALG often causes more harm than good by interfering with call signaling, leading to dropped calls, one-way audio, or registration failures. Many businesses disable SIP ALG to ensure more stable VoIP communication.
Why Disable SIP ALG?
Knowing how SIP ALG works helps businesses by:
Preventing VoIP call disruptions caused by incorrect packet modification
Reducing dropped calls and one-way audio issues
Ensuring more reliable SIP registration and call routing
Improving compatibility with cloud-based VoIP services
Simplifying network troubleshooting for IT teams
