Re: Verizon Wireless LTE/4G and SIP Header Manipulation

[Mark Stevens <manager () monmouth com>]

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