AT&T uVerse blocking SIP?

Tue Jan 27 14:58:35 UTC 2015

I agree. I always leave ALGs off, its just 10x harder when the support
asked what SIP was and then told me it's not a common protocol since it's
not in his magic book :)

On Tue, Jan 27, 2015 at 7:50 AM, Jared Mauch <jared at puck.nether.net> wrote:

> 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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