However, if you don't enable or don't configure the ATA's firewall correctly, it could be used as a vector to attack your internal network, or worse. If your VoIP ATA has an internal firewall of its own, you can also try configuring the XB7 to put the ATA on a DMZ. I'm not sure what else to suggest at this time. OBi's support page also has some suggestions if you cannot disable SIP ALG: but it's really frustrating when SIP ALG breaks things and disabling it causes other breakage. also for more advanced situations, like SIP Trunking. Ask your SIP provider - these days many of them have a way of testing for the ALG, some even put it on their 'dashboard'. ![]() Mac OSX Based Testing This link will download a small APP agent that can test for the presence of a SIP ALG on the network the host MAC is connected to. If you see 'SIP ALG Firewall: N' then a SIP ALG is was not detected. SIP ALG is needed when you have multiple SIP clients behind the firewall. 1 Answer Sorted by: 2 Theres no quick test - you would need to be able to examine the SIP packets after theyve been sent by the router to the host system, and see if the payload has been tinkered with. If you see 'SIP ALG Firewall: Y' then a SIP ALG is active and must be turned off. Must have Java installed for this to work properly. However, it needs to be implemented properly and the SIP components and endpoints also need to be compliant with current standards. SIP ALG Detector (Windows)- Used to check networks for SIP ALG SIP ALG Detector (Mac OS)- Used to check networks for SIP ALG Other Tools Used By Intermedia Technicians Online Traceroute - Used to verify the route data travels from a customer's site to Intermedia. Posted about my SAB listing a few weeks ago about not showing up in search only when you entered the exact name. Protocols like SIP and H.323 were not really designed to traverse Internet firewalls and are not NAT friendly. If the XB7's SIP ALG implementation is causing problems, even Comcast Tech Support suggests enabling Bridge Mode and using your own router.Ī SIP Application Layer Gateway (ALG) or SIP Helper is not necessarily a bad thing. This tool shows in just a few seconds if SIP ALG is enabled on port 5060 (TCP & UDP). There is no option in the UI, nor do we have much control over the gateway's firewall. A quick google search for SIP ALG detector will find you a couple web tests and client-based tools that can check for you like this one on our support site. ![]() I don't know of any way to disable the SIP ALG on the Ignite gateways. It’s the fastest and easiest way to check if you’re on the right track. They may be able to recommend configuration changes for your OBi202 ATA and make some changes on their side so that their service plays nicely with the XB7. Let them know the problems that you are experiencing, and tell them that you have an Comcast Xfinity XB7 gateway. Make sure the Windows machine is connected to the telephony network. I think your best bet would be to contact your VoIP provider (Anveo?) for tech support. To find out if SIP ALG is disabled, please download the attached file for Windows.
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