[183952] in North American Network Operators' Group
Re: Verizon Wireless LTE/4G and SIP Header Manipulation
daemon@ATHENA.MIT.EDU (William McCall)
Tue Sep 22 15:58:02 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <CAL9jLab8tK3z7H-f6sTGKUWyXrA2bfTv4ZwG8U2Zz1bbAqV9EQ@mail.gmail.com>
Date: Tue, 22 Sep 2015 12:57:58 -0700
From: William McCall <william.mccall@gmail.com>
To: Christopher Morrow <morrowc.lists@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
I've seen this behavior before (a few years back). Moved off of VzW for
this reason (i'm lazy to implement workarounds).
IIRC when i investigated, the ALG was trying to not do something nefarious
but just poorly implemented.
On Tue, Sep 22, 2015 at 12:51 PM, Christopher Morrow <
morrowc.lists@gmail.com> 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
>
--
William McCall
