SIP ALG


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SIP ALG

(SIP Application-Level Gateway) A function in a router that allows SIP-based VoIP packets to traverse the network's firewall. Because Internet-based telephony is so widely used, the SIP ALG function is often enabled by default in many routers, including consumer-based wireless routers. However, SIP ALG implementations are not the same and are known to cause problems, including failing to handle incoming calls. In such cases, the function must be disabled, and either a SIP proxy is deployed or ports are opened in the router to allow VoIP traffic to reach the telephone switch (PBX). See SIP proxy and SIP.


Turn It Off
SIP ALG was disabled in order to allow VoIP calls to reach the PBX in this installation.
References in periodicals archive ?
In addition to the introduction of the NetVanta 7060, ADTRAN also announced the availability of a number of new features for the NetVanta 7000 Series, including: SIP Trunking, SIP proxy (eliminating the need for an external SIP ALG device), system scheduler, the ability to function as a wireless controller, and VQM.
Like all members of the NetVanta family, the NetVanta 3448 and 3430 are based on the ADTRAN Operating System (AOS), which provides a wealth of features and benefits to users including a user-friendly Command Line Interface (CLI) and Web-based Graphical User Interface (GUI), NAT-compatible SIP ALG for VoIP applications, Quality of Service (QoS) for delay-sensitive applications, and Virtual Private Networking (VPN).
Each of these devices offers a variety of standard features including: standards-based routing/switching protocols; stateful inspection firewall for network security; IPSec VPN for secure corporate connectivity across the Internet; a familiar Command Line Interface (CLI) that eliminates re-training of technical personnel; a user-friendly Web-based Graphical User Interface (GUI); NAT-compatible SIP ALG for VoIP applications; Quality of Service (QoS) for VoIP and other delay-sensitive applications; and an analog dial-backup interface for disaster recovery/mission critical applications or for remote management by the carrier.