If you are able to disable SIP ALG, make sure you reboot the router immediately following its removal and then reboot each hardware phone/softphone on your network too. There will be plenty of commentary on whether it can be disabled and if so what the steps are to do it. Remember VoIP uses standard protocols, so we can assure you if it's a problem for you and Yay.com, it will be a problem for many others. On the same giveaway routers, we sometimes even see SIP ALG continue to interfere with traffic despite being set to "off" on a router the router clearly ignoring the instruction it's been given.ĭisabling SIP ALG To see if your router/firewall may be affected by SIP ALG, simply "Google" the make and model of your router/firewall followed by the words SIP ALG.
#ENABLE SIP ALG SERIES#
We regularly see particularly poor implementations on the giveaway routers that come with broadband connections and we would always recommend replacing them with a proper business-grade router like the Draytek series to eradicate the problem altogether. Algorithms on firewalls will often be deciding at which point SIP ALG is to inspect your traffic, it could be on your first VoIP calls, it could be following a certain set pattern of traffic. SIP ALG doesn't always show its colours straight away. One way audio, created by SIP ALG stopping our data from reaching your network.Hardware Phones and Softphones look like they are registered but are unable to receive call control data in or out to make your phone ring or transfer between callers.Hardware Phones and Softphones not registering with our platform at all.Yay.com and other VoIP providers regularly find that the SIP ALG modifies SIP packets in unexpected ways, corrupting them and making them unreadable. In many cases, it is poorly implemented and actually causes more problems than it solves.
All good firewalls allow this "feature" to be turned off in their settings and good business-grade routers like the Draytek series have it disabled by default.
It's a "feature" that runs on a firewall and/or router. SIP ALG is an Application Layer Gateway intended to provide protection to private IP addresses on a NAT'd (Network Address Translated) network.
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