[183955] in North American Network Operators' Group
Re: Verizon Wireless LTE/4G and SIP Header Manipulation
daemon@ATHENA.MIT.EDU (Jared Mauch)
Tue Sep 22 16:41:36 2015
X-Original-To: nanog@nanog.org
From: Jared Mauch <jared@puck.nether.net>
In-Reply-To: <CAL9jLaaEjMBgtsFc1_+ALJPvsC-u3wxUD+zYHvhthCuhjSkSOg@mail.gmail.com>
Date: Tue, 22 Sep 2015 16:37:53 -0400
To: Christopher Morrow <morrowc.lists@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> On Sep 22, 2015, at 4:24 PM, Christopher Morrow =
<morrowc.lists@gmail.com> wrote:
>=20
> On Tue, Sep 22, 2015 at 4:16 PM, Mark Stevens <manager@monmouth.com> =
wrote:
>> The TAG unique identifier is being changed and this only happens =
through VZ
>> LTE networks, not wired networks or even other cellular data networks
>> (Sprint, ATT, T-Mobile)
>> Their phones are IPV6 so the packets are getting converted to IPV4 so =
it is
>> either happening there or there is a global ALG in Verizon land that =
is
>> doing it .
>> For positive proof I would need Verizon to fess up (LOL) but that =
will not
>> happen or sniff traffic from the cellphone itself.
>=20
> welp, interesting, good luck in your battle with the pstn.
I=E2=80=99ll say it=E2=80=99s not just VZW that does this, there are =
issues with many CPE devices
that mangle SIP traffic due to broken ALG. My plea is if you=E2=80=99re =
a carrier
that provides a CPE, *please* provide an option to disable the ALG, or =
expose it
to the customer so they can disable it. *Looks in 7018/7132 direction*
- Jared=
