Re: Issues with SIP packets between VZ Fios and NTT

[Dovid Bender <dovid () telecurve com>]

It's not strictly UDP. I spoke with someone yesterday that was re-producing
it with curl.

On Tue, May 14, 2019 at 2:04 AM Saku Ytti <saku () ytti fi> wrote:

> Can someone try to recreate the problem with TCP/5060. Or do iperf
> test on equivalent ports with UDP+TCP, to determine if the problem is
> related specifically to UDP.
>
> Most networks have some form of limits to even transit traffic, UDP is
> most typical L4 to have policers.
>
> On Tue, 14 May 2019 at 00:12, Pete Rohrman <prohrman () stage2networks com>
> wrote:
> > Dovid Bender,
> >
> > I'm seeing the  same sort of thing.  Polycom phones.   Multiple
> customers getting to me from Verizon in NYC area.  I'm seeing phones
> register for a while, then drop off, then I see them trying to re-reg
> resulting in your 401 below.
> > Call me.  212 497 8015.  Let's look at this.
> >
> > Pete
> >
> > Pete Rohrman
> > Stage2 Support
> > 212 497 8000, Opt. 2
> >
> > On 5/13/19 12:20 PM, Dovid Bender wrote:
> >
> > Thought of that. Customers have their own CPE's. So far the only thing
> mutual here is that it's NTT -> VZ. Here is what I found so far looking at
> two Polycom phones using non standard ports (e.g. not 5060)
> > 1) PhoneA tries to register multiple extensions and for each request we
> send a 401. We expect to get back a REGISTER request with a no-once but we
> don't. This happens for a while and then magically it starts working.
> > 2) PhoneB tries to register the time time as PhoneA and has no issues.
> >
> > At first I thought it was something possibly with the SIP call-ID but I
> ruled that out since in the same SIP DIALOG it was not working then it
> started. Also the seems to be per phone each phone is behind NAT and the
> traffic is coming from a different NAT'd port. Seems like there is some
> device in the middle that is randomly dropping traffic on specific sessions.
> > On Mon, May 13, 2019 at 11:40 AM Brielle Bruns <bruns () 2mbit com> wrote:
> > > On 5/13/2019 9:21 AM, Dovid Bender wrote:
> > > > Hi,
> > > >
> > > > Over the last 48 hours we have been getting a lot of alerts of
> customers
> > > > phones losing registrations to us. All the complaints are coming from
> > > > customers that are on VZ Fios in the NYC area. Anyone else see
> anything
> > > > strange going on?
> > >
> > >
> > > While you are diagnosing, might check to make sure that the SIP ALG is
> > > disabled on all of their routers too.
> > >
> > >
> > >
> > > --
> > > Brielle Bruns
> > > The Summit Open Source Development Group
> > > http://www.sosdg.org    /     http://www.ahbl.org
>
>
>
> --
>   ++ytti