AT&T uVerse blocking SIP?

Tue Jan 27 14:50:34 UTC 2015

I’ve never gotten AT&T to respond to issues, including the fact the device eats the SIP packets, and some types of SIP packets can actually cause their device to reboot as well.

It’s been a few years now since I really chased this down, but beware all of these ‘helpers’, including the Cisco SIP-ALG are broken.  It’s more damage introduced by these CPE devices (like broken DNS proxies, etc).

- Jared

> On Jan 27, 2015, at 9:47 AM, Brad Bendy <bb at 1stclasshosting.com> wrote:
> 
> They are saying this CPE has no ALG in it, but they can enable DMZ, which acourse made zero difference.
> 
> What I do find funny is they escalated the problem to Tier-2 and wanted to enroll the customer in premium tech support for $15 a month, because the Internet signal is strong and is not causing the problem, sigh.
> 
> Back to trying port 5061 it appears!
> 
> On Mon, Jan 26, 2015 at 8:44 PM, Christopher Morrow <morrowc.lists at gmail.com> wrote:
> I think this is due to the CPE using a particular ALG ... (from
> recollection having never been a UVerse customer, but having sat
> through a long, long, long set of discussions about the
> merits/demerits of sip blocking)
> 
> On Mon, Jan 26, 2015 at 10:22 PM, Jared Mauch <jared at puck.nether.net> wrote:
> > Yes.  If you move to another port, e.g.: 5061 it works fine.
> >
> > If you’re running on a Linux based system, you can do this:
> >
> > /sbin/iptables -A PREROUTING -t nat -i eth1 -p udp --dport 5061 -j REDIRECT --to-port 5060
> >
> > on the host to remap 5061 -> 5060 with no application change.
> >
> > - Jared
> >
> >> On Jan 26, 2015, at 4:26 PM, Brad Bendy <bb at 1stclasshosting.com> wrote:
> >>
> >> Has anyone seen issues where a end user on uVerse trying to connect to
> >> either another provider or AT&T non uVerse (in this case DIA) is having SIP
> >> blocked? SIP leaving the uVerse network going to another uVerse DSL account
> >> is fine, but it appears soon as it leave the uVerse network all SIP traffic
> >> is blocked?
> >>
> >> It appears others have seen this problem, some say it's a modem issue, some
> >> say they are truly blocking it. Ive yet to call uVerse support yet as im
> >> guessing ill get no where.
> >>
> >> Thanks for any insight on this.
> >>
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