You forgot Rule #3, It is the ISP's fault. On Fri, Dec 4, 2020 at 9:32 AM Ken Hohhof <[email protected]> wrote:
> I thought the rules of troubleshooting VoIP were: > > Rule #1: It's a NAT or ALG problem > Rule #2: Refer to Rule #1 > > -----Original Message----- > From: AF <[email protected]> On Behalf Of Nate Burke > Sent: Friday, December 4, 2020 8:43 AM > To: AnimalFarm Microwave Users Group <[email protected]> > Subject: Re: [AFMUG] Offnet SIP and Multi-homing > > I use Grandstream, and BLF is Broken when trying to use SIP over TCP. > I've never had a NAT problem before. I was just checking the other Offnet > phones that I have, and through sheer happenstance, those handsets all > coming in and leaving on the same transit provider. > > Interesting is that the Grandstream Softphone client on my cell phone works > fine, it's only the Grandstream handsets that are the problem. I'm guessing > they are setting the call up in 2 different ways, and one is affected while > the other is not. I haven't done enough packetcaptures to see if there is > a > difference between the packet streams. > > > > On 12/4/2020 8:07 AM, Adam Moffett wrote: > > Is there a reason not to use SIP over TCP? > > > > I think in the past I thought retransmits were irrelevant in a > > realtime app, but the latency is low enough sometimes now that maybe > > it would actually help. And TCP seems to traverse NAT more easily. > > > > > > On 12/3/2020 6:18 PM, Nate Burke wrote: > >> I'm trying to track down a strange Issue I'm having, and wondering if > >> anyone has run into something similar. > >> > >> I have a couple customers that I let take phone handsets home, the > >> Grandstream PBX is at our office. It seems that if the SIP traffic > >> comes in one upstream, but leaves another upstream, really weird > >> things happen. > >> > >> The Phone registers to the PBX just fine, and can receive calls all > >> day long, it just cannot make calls. If I take a /24 and force it to > >> enter and leave the network via the same provider, then everything > >> works fine. Those of you that have multiple diverse paths, have you > >> seen something like this? The Call in UDP Mode fails, the call in > >> TCP mode will succeed. > >> > >> This only appears to be an issue with the handset talking to the PBX. > >> All of our Sip Trunk traffic (Voip Innovations) works just fine. For > >> some reason the handset SIP re-invite never makes it back to the > >> handset when multi-homing is in place. > >> > >> > >> > > > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Lewis Bergman 325-439-0533 Cell
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