[VoiceOps] Phone auth for incoming calls?

[Carlos Alvarez]

It has, but it wasn't that long ago that people were still having
challenges.  Our preferred phone vendor, Grandstream, still generally
advises against it.

So...who else on the list uses TCP and has any comments about it?


On Wed, Aug 8, 2018 at 11:12 AM Alex Balashov <abalashov at evaristesys.com>
wrote:

> That has changed greatly since 2005.
>
> On August 8, 2018 2:07:50 PM EDT, Carlos Alvarez <caalvarez at gmail.com>
> wrote:
> >That's a change I've never investigated.  Or more precisely, haven't
> >investigated since the days when the advice for doing it was "good
> >luck!!"
> >
> >
> >On Wed, Aug 8, 2018 at 11:00 AM Alex Balashov
> ><abalashov at evaristesys.com>
> >wrote:
> >
> >> I would have to agree with Calvin. Just use TCP.
> >>
> >> On August 8, 2018 1:58:47 PM EDT, Calvin Ellison
> ><calvin.ellison at voxox.com>
> >> wrote:
> >> >Using TCP or TLS would avoid open NAT issue, and can cure some
> >naughty
> >> >SIP
> >> >ALG issues as well, assuming you want to tolerate the overhead.
> >> >
> >> >For UDP, we've used both Digest and Source request validation with
> >> >Polycom
> >> >devices. Source validation is probably the easiest route, assuming
> >the
> >> >UA
> >> >doesn't need to receive calls from anyone but its proxy or
> >registrar.
> >> >Digest (nonce challenge) is better if you want to accept calls from
> >> >anyone
> >> >who knows your password, but we had an issue with a softswitch that
> >> >would
> >> >properly handle auth channel to INVITE but choked when a BYE was
> >> >challenged.
> >> >
> >> >
> >> >
> >> >
> >> >Regards,
> >> >
> >> >*Calvin Ellison*
> >> >Voice Operations Engineer
> >> >calvin.ellison at voxox.com
> >> >+1 (213) 285-0555
> >> >
> >> >-----------------------------------------------
> >> >*voxox.com <http://www.voxox.com/> *
> >> >5825 Oberlin Drive, Suite 5
> >> >San Diego, CA 92121
> >> >[image: Voxox]
> >> >
> >> >On Wed, Aug 8, 2018 at 10:43 AM, Carlos Alvarez
> ><caalvarez at gmail.com>
> >> >wrote:
> >> >
> >> >> Do most of you have the phones authenticate incoming calls?  We
> >> >haven't
> >> >> been, but occasionally find a router that has unfiltered full cone
> >> >NAT
> >> >> (Cisco) or that puts one phone on 5060 with no filtering by IP.
> >The
> >> >result
> >> >> is that the phone will start ringing at random as script kiddies
> >hit
> >> >the IP
> >> >> and port 5060 trying to find servers to exploit.  I don't see a
> >> >downside to
> >> >> changing to auth, but not having done it outside of a few tests of
> >a
> >> >small
> >> >> number of phones, I figured I would ask.
> >> >>
> >> >>
> >> >> _______________________________________________
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> >> >>
> >> >>
> >>
> >>
> >> -- Alex
> >>
> >> --
> >> Sent via mobile, please forgive typos and brevity.
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> >> VoiceOps at voiceops.org
> >> https://puck.nether.net/mailman/listinfo/voiceops
> >>
>
>
> -- Alex
>
> --
> Sent via mobile, please forgive typos and brevity.
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