8/28/2023 0 Comments Enable sip alg![]() ![]() ![]() If it can’t be disabled, that device cannot be used with our platform (or any other hosted VoIP system for that matter). 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. The NAT TCP SIP ALG Support feature allows embedded messages of the Session Initiation Protocol (SIP) passing through a device that is configured with Network Address Translation (NAT) to be translated and encoded back to the packet. class-maptypeinspectmatch-any class-map-name 4. 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. How to Configure Cisco Firewall-SIP Enhancements ALG Enabling SIP Inspection SUMMARY STEPS 1. Solution: By default, FortiGate is using SIP ALG to process SIP traffic however some SIP providers recommend disabling SIP ALG in the firewall. The SIP ALG uses theIP addresses and port numbers recorded in the pinhole table to openpinholes and allow media streams to traverse the device. Currently supported FortiOS versions have SIP-ALG enabled by default. This article describes methods to choose SIP-ALG and Session Helper. The SIP ALG examines the SDP portion of the packet, anda parser extracts information such as IP addresses and port numbers,which the SIP ALG records in a pinhole table. 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. Fortinet recommends to disable the SIP session-helper (Layer4), and use the SIP Application Layer Gateway (ALG) (Layer7). 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. ![]()
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