AT&T CallVantage VoIP calls blocked

Tom Keating : VoIP & Gadgets Blog
Randy Savicky
| VoIP & Gadgets blog - Latest news in VoIP & gadgets, wireless, mobile phones, reviews, & opinions

AT&T CallVantage VoIP calls blocked

Some VoIP calls being blocked | CNET has reported that some users are having issue receiving inbound calls. This has once again raised the issue of whether or not cable broadband companies are blocking VoIP calls.

I discussed the potential for network service providers to block VoIP traffic in my Vonage Outage Part 2 blog entry. Damn hypercompetive bastards!

A TMC VoIP Forum poster also commented on not being able to receive inbound calls, as seen in the thread titled "AT&T Call Vantage Sucks"

According to Cnet, AT&T is using a non-standard VoIP port - port 69 to be precise. Most VoIP providers use the standard SIP port - 5060. Apparently, port 69 was used by the MSBlast virus, so many ISPs are now filtering this port.

When will AT&T learn? Stick with the standards and don't go "all proprietary on us" and you'll be all right...

Related Articles to 'AT&T CallVantage VoIP calls blocked'

Featured Events