nanog mailing list archives
Re: Issues with SIP packets between VZ Fios and NTT
From: Dovid Bender <dovid () telecurve com>
Date: Mon, 13 May 2019 14:44:40 -0400
In our case we are not using 5060. The issue seems exclusive to VZ. On Mon, May 13, 2019 at 2:43 PM Jared Mauch <jared () puck nether net> wrote:
This matches my experience with running SIP on networks. Slowly over the years it became more unreliable as “helper” ALGs were in the path. Eventually we moved some devices off 5060 to alleviate the problem. Sent from my iCar On May 13, 2019, at 2:32 PM, Dovid Bender <dovid () telecurve com> wrote: FYI: More than one person reached out to me off list. The issue is clearly with VZ. Traces by the others were done and NTT was not in the mix. The only common denominator was 401 SIP packets hitting VZ Fios IP's in the NY area. On Mon, May 13, 2019 at 1:04 PM Dovid Bender <dovid () telecurve com> wrote:Good ol UDP encrypted. On Mon, May 13, 2019 at 12:49 PM Brielle Bruns <bruns () 2mbit com> wrote:On 5/13/2019 10:20 AM, 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 farlookingat two Polycom phones using non standard ports (e.g. not 5060) 1) PhoneA tries to register multiple extensions and for each requestwesend a 401. We expect to get back a REGISTER request with a no-oncebutwe don't. This happens for a while and then magically it startsworking.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 butIruled 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 andthetraffic is coming from a different NAT'd port. Seems like there issomedevice in the middle that is randomly dropping traffic on specificsessions. Are you using TLS encrypted SIP or just plain ol' cleartext? If its encrypted, I'd look at possibly there being a MTU/MSS issue somewhere along the path possibly? -- Brielle Bruns The Summit Open Source Development Group http://www.sosdg.org / http://www.ahbl.org
Current thread:
- Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Brielle Bruns (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Brielle Bruns (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Jared Mauch (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Brielle Bruns (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Pete Rohrman (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Saku Ytti (May 13)
- Re: Issues with SIP packets between VZ Fios and NTT Dovid Bender (May 14)