Is Comcast blocking my VOIP?

Question

I was successfully using my Voicestick voip to call out when I had AT&T dsl. However, now that I've switched to a wireless LAN using Comcast, I can't make my outbound calls with my Voicestick softphone. It gives me a code

12002 timeout error when I try to authenticate.

I've tried connecting with my software firewall to allow, and with it completely turned off. I tried port-forwarding the recommended Voicestick ports to my computer while my software firewall was off. I finally tried putting my computer in the router's DMZ with my software firewall turned off. I just couldn't get a call to go through. I can't think of anything that's stopping the show except Comcast. Could there be another reason? Thanks.

Thomas T. Veldhouse · Accepted Answer

Comcast and 3rd party VoIP works just fine. You almost certainly have your router and/or adapter (stick) configured incorrectly. Can you hook that "VoiceStick" directly to your cable modem [or is it a USB bit that connects to a PC}?

M.L. · Answer

I'm not using the stick, just their softphone.

Thomas T. Veldhouse · Answer

Firewall issue ... either on your computer or on your router ... I am about

100% sure of this. I am 100% sure that Comcast is not blocking VoIP. They took enough heat with their interference with torrents to even consider blocking VoIP for anti-competitive reasons.

M.L. · Answer

Thanks for your reply. I had already tried shutting down my router and software firewalls with no success. Turns out that my WinXP Telephony service was set to Manual. After setting it to Started->Automatic and rebooting, I could make outgoing calls.

RP · Answer

I believe VoIP does not work if you are using a private IP address (NAT) behind your router/firewall. It could also be a software issue with your router. Check with your router vendor for VoIP support and NAT.

formatting link

RP

M.L. · Answer

Thanks for your reply. I found the problem was that the TelephonyService was not turned on on my system.

Is Comcast blocking my VOIP?

Join the Discussion

Didn't find your answer?