[183953] in North American Network Operators' Group
Re: Verizon Wireless LTE/4G and SIP Header Manipulation
daemon@ATHENA.MIT.EDU (Mark Stevens)
Tue Sep 22 16:16:34 2015
X-Original-To: nanog@nanog.org
To: Christopher Morrow <morrowc.lists@gmail.com>
From: Mark Stevens <manager@monmouth.com>
Date: Tue, 22 Sep 2015 16:16:28 -0400
In-Reply-To: <CAL9jLab8tK3z7H-f6sTGKUWyXrA2bfTv4ZwG8U2Zz1bbAqV9EQ@mail.gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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.
On 9/22/2015 3:51 PM, Christopher Morrow wrote:
> On Tue, Sep 22, 2015 at 12:22 PM, Christopher Morrow
> <morrowc.lists@gmail.com> wrote:
>> On Tue, Sep 22, 2015 at 12:03 PM, Mark Stevens <manager@monmouth.com> wrote:
>>> Hi All,
>>>
>>> Has anyone seen that something (most likely an alg) on Verizon's LTE/4G
>>> network is rewriting SIP headers,in particular From Tag identifiers? We
>>> cannot make a SIP call from our cellphones (using cellular data) beyond 30
>>> seconds because the TAGs are rewritten and the destination Asterisk server
>>> drops the call because of this.
>>>
>> I'm shocked that the cellular carrier is making over-the-top phone
>> calls non-functional. I'm sure they'll agree to meet you at their CO
>> so you can do the proper work request sometime between 6am and 7pm in
>> 2 weeks time.
>>
> joking aside, are you sure the packets get mangledin VZW and not
> elsewhere along the path? how would you be able to prove it?
>
>> go incombancy!
>>
>>> Thanks
>>>
>>> Mark
