Ah yes the ALG 5060 port is not blocked. ". They cast this as an enterprise service. Somewhere in the middle is what I do, we peer with the carriers. We were having VPN problems, too. Step 2 - Change the default –voip –alg-mode, set default-voip-alg-mode kernel-helper based, Step 3 - Either clear sessions or reboot to make sure changes take effect, "Application Level Gateway (ALG) Configuration". On Cisco devices, SIP-ALG is known as SIP Fixup and this option is enabled by default. These are working great and our VoIP and VPN problems are gone. SIP? Please see list below for instructions for your particular device. Their business side is a whole different thing than their comsumer side.
They’ll block vonage and make it appear that the Vonage service is problematic when in fact they’re just blocking ports. Comparing and carrier to an ITSP is not fair. Information on the web, such as this knowledgebase article... We replaced our DPC3939B with an Arris SB6183 and TP-Link wireless router. AND THEY EVEN CALLED IT A MODEM – look at the docs it says its a modem! IMHO this is malfeasance from Comcast - disabling features to force you to buy additional services from them rather than standards based competitive solutions. Go with BroadVoice – 5 Lines / $55 month (TOTAL not each!) If you are having an issue with one of your SIP devices where you believe the embedded SIP subpacket within the Ethernet Packet is being blocked, I would first use your SIP analyzer to make sure that SIP ALG is disabled on the SIP device. A third party SIP provider can provide lower rates but it is a best effort service. To disable the SIP ALG / SIP Fixup please run the following command on the configuration interface Routers (General) no ip nat service sip tcp port 5060 no ip nat service sip udp port 5060. I personally use BroadVoice and their customer service is top notch, and cheap - 5 lines $55/month. We have a DPC3939B gateway on our Comcast Business account. Different Technicolor routers may have different instructions. To better help everyone understand the differences between these two devices, I've created this thread in hopes of better explaing... “When you bridge a gateway, you are basically removing the extra features of the gateway and turning the device into a plain modem.”. Customer service is the worst of any company Ive ever dealt with it, its maddening.
A feature called SIP Application-Layer Gateway, or SIP ALG, is known to cause issues with VoIP Communication. Time Warner support was aware of the SIP ALG features and disabled it in their device (an Arris) and things worked better. In such cases you may experience issues registering your handset, one-way or no audio, unable to receive calls, and issues with Busy Lamp Field (BLF) and Message Waiting Indicators (MWI). Comcast/Cisco apparently are the ones confused about what a MODEM vs ROUTER is, not me, they are the ones that made a router that secretly blocks SIP, and appears to act like a modem but isnt one. Vantage Unified has created this article to assist with properly configuring your SonicWall device. So is your comment, the OP asked about Comcast SIP service not their Internet service. @kbocek The documentation mentions NOTHING about SIP ALG,so I assumed that it does not have it enabled, continue troubleshooting for many hours with the SIP Trunk provider. http://www.dslreports.com/forum/r29955635-Anyone-with-a-Comcast-DPC3939B-gateway. However, Comcast/Cisco made this very special router/modem with LAYER 3, SIP INTERFERING BRIDGE MODE. plug it in and register it. See also this post where the customer found that Comcast was blocking ports 5060-5090 so he had to use a higher port to get around them, http://www.dslreports.com/forum/r18718254-comcast-blocking-voip-ports. Except where otherwise noted, content on this wiki is licensed under the following license: How to Disable SIP ALG on the Technicolor TG582n SB and TG589vn V3 Modem Router, How to Disable SIP ALG on the Technicolor TG589VAC and and TG588v v2 Router, CC Attribution-Noncommercial-Share Alike 4.0 International. It may not have been a large area affected so it may not have made the forums but this poster is most like telling the truth. They require you to use their rented equipment if you want static IP service. I was installing a SIP Trunk, but having problems with it. The owner of the network can provide end to end QoS. Contact us and we will be happy to provide a quote.
In fairness, that’s not a Comcast employee. Here is the follow-up on this. Below is some more information on Bridge Mode for this router. A modem is not a router. When they put the modem in “bridge mode” all they do is disable that subnet. 38 votes and 39 comments so far on Reddit, I’m not going to cite too many sources for Comcast being the worst ISP customer service because all you have to do is google it to find the facts, but here is where I said they have more FCC complaints than all of their competitors combined.
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