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SIP ALG(Session Initiation Protocol Application-Level Gateway) A function in a router that allows VoIP packets to traverse the network's firewall. Because Internet-based telephony emerged so quickly, the SIP ALG function was often enabled by default in many consumer-based wireless routers. Because various implementations caused problems, the ALG setting later defaulted to "disabled." See SIP, SIP proxy and STUN.
|Turn It Off in the Router Control Panel|
|SIP ALG was disabled in order to allow VoIP calls to reach the PBX in this installation.|
|Is ALG On or Off?|
|If users cannot access their router's control panel to find out if ALG is turned on, this Windows utility from RingLogix does the job.|
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