[VoiceOps] Issues with ISPs blocking SIP 5060 - 5061

Todd Wolf twolf at unifiedtechnologies.com
Wed Nov 20 20:23:05 EST 2013

We have run into with them and ask for them to to turn off nat mode and put the modem into bridge mode and then a reboot of the modem usually solves the problem... Some of the combo modems with fxs voice ports have been known to intercept the sip traffic and we ultimately had to have them replace the modem model as they didn't know how to disable it and wouldn't grant us access to the modem

Sent from my iPhone

On Nov 20, 2013, at 8:16 PM, "Mark R Lindsey" <mark at ecg.co<mailto:mark at ecg.co>> wrote:

In 2005, the FCC fined a NC based ISP $15,000 for blocking VoIP ports.


Since that time, in my IANAL way, I've always worked as if  "section 201(b) of the Communications Act of 1934, as amended" meant you couldn't block VoIP ports simply for the sake of preventing VoIP use.

>>> mark at ecg.co<mailto:mark at ecg.co> +1-229-316-0013 http://ecg.co/lindsey

On Nov 20, 2013, at 19:14 , Hiers, David <David.Hiers at adp.com<mailto:David.Hiers at adp.com>> wrote:

I don’t know of anything that obligates an ISP to carry any particular form of traffic.  All the AUPs that I've seen have plenty of room for them to block pretty much whatever they want, but it's been a while since I've one do this kind of thing.

You might get some traction with your state consumer protection or public utility office.


From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of David Thompson
Sent: Wednesday, November 20, 2013 15:51
To: voiceops at voiceops.org<mailto:voiceops at voiceops.org>
Subject: [VoiceOps] Issues with ISPs blocking SIP 5060 - 5061

Has anyone been having problems lately with ISPs’ actively blocking UDP 5060 – 5061? I’m having problems with Road Runner in Hawaii apparently blocking those ports preventing me from communicating with the customers PBX. My customer has a ticket open with them but we aren’t confident that we’ll get anywhere with them. If we don’t is there an authority that we can speak with that can make them open those ports or face sanctions?

David Thompson
Network Services Support Technician
(O) 858.357.8794
(F) 858-225-1882
(E) dthompson at esi-estech.com<mailto:dthompson at esi-estech.com>
(W) www.esi-estech.com<http://www.esi-estech.com/>

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