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.li...@gmail.com> wrote: > On Tue, Sep 22, 2015 at 12:22 PM, Christopher Morrow > <morrowc.li...@gmail.com> wrote: > > On Tue, Sep 22, 2015 at 12:03 PM, Mark Stevens <mana...@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
