6/19/2023 0 Comments Application layer gateway firewallThis 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.
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