A number of ALGs for common applications are enabled byĪs per comment to this question I did look into this, however the security part if applicable is not covered in that thread. Each ALG provides special handling for a specific protocol orĪpplication. Of the IP payload to make them work with network address translation Some protocols and applications require special handling This is what it says.Īpplication Level Gateway (ALG) Configuration Here you can enable orĭisable ALGs. There's some info under Help but I could not get much idea from it.

What exactly is this ALG and for better security (in case any), should I keep them enabled or disabled? What is recommended from better security point of view. I am particularly interested in ALG settings. It has a handful of options to configure under Firewall settings. If it can’t be disabled, that device cannot be used with our platform (or any other hosted VoIP system for that matter).I have DIR615 300M Router. If it is running, ask them how that can be disabled. The only way to truly confirm if it is enabled or not would be to contact the vendor and have them verify if a SIP Application Layer Gateway is running on the device. If your firewall/router does not have an option to disable SIP ALG, that does not mean that it is not running it just means you cannot disable it.

This function can have different names (SIP ALG, SIP Helper, SIP Inspection, SIP Transformations, etc.), but ultimately, they all perform a similar function - identifying SIP packets and manipulating them. Many routers and firewalls have SIP-specific settings that manipulate how SIP traffic is handled, with the intent to help alleviate traditional issues that applications with specific addressing requirements like SIP have with NAT traversal. Any SIP Application Layer Gateway on your network must be disabled in your firewall, as it will always break SIP, which the phones use as their signaling protocol.

Alg application layer gateway