Session Initiation Protocol Application Layer Gateway (SIP ALG) is a feature found in many routers and firewalls, designed to assist with VoIP traffic. While its intentions may be good, SIP ALG often causes more problems than it solves for IT professionals, particularly when working with VoIP platforms. In this blog post, we'll delve into the specifics of SIP ALG, explore which routers have it enabled by default, discuss how to disable it, and highlight the symptoms it can cause when improperly configured. We'll also cover how Viirtue's support team can help diagnose and resolve these issues.
SIP ALG, or Session Initiation Protocol Application Layer Gateway, is a feature in routers and firewalls that is intended to help facilitate VoIP communication. It works by inspecting and modifying VoIP traffic to improve compatibility and traversal across network address translations (NAT). However, modern VoIP platforms have advanced NAT traversal techniques built-in, making SIP ALG unnecessary and often problematic.
Several routers have SIP ALG enabled by default, including models from popular brands like (bonus: click the hyperlink for access to guides and manufactuer support portals):
It's essential to check your router's documentation or manufacturer's website to determine if your specific router has SIP ALG enabled by default.
When SIP ALG is enabled on a router or firewall, it can interfere with VoIP platforms and cause various issues, such as:
To resolve these issues, you can disable SIP ALG on your router or firewall. This process varies depending on the specific device, so consult your router's documentation or manufacturer's website for a detailed guide. In general, the steps involve:
Viirtue's support team is comprised of experienced IT professionals who are well-equipped to diagnose and resolve SIP ALG-related issues. If you're experiencing problems with your Viirtue VoIP platform, reach out to the team at support@viirtue.com for assistance. They can help you identify whether SIP ALG is causing the issue and guide you through the process of disabling it on your specific device.
Conclusion
SIP ALG is a feature that, while well-intentioned, often causes more harm than good when it comes to VoIP platforms. If you're an IT professional working with VoIP systems, it's essential to understand the implications of SIP ALG, how to disable it, and the symptoms it can cause. For assistance in diagnosing and resolving these issues, don't hesitate to contact Viirtue's support team at support@viirtue.com.