On Tue, Aug 9, 2011 at 8:31 PM, Lee Howard <fax...@howardsilvan.com> wrote: > Steve Totaro wrote: >> >> On Tue, Aug 9, 2011 at 7:22 PM, Lee Howard <fax...@howardsilvan.com> >> wrote: >> >>> >>> Ryan McGuire wrote: >>> >>>> >>>> Unless your network is under load and you are seeing dropped packets >>>> and high jitter, I would absolutely not do T.38. The cheapest and >>>> easiest approach that I have found is to buy yourself an FXS gateway >>>> and just make sure you are using ulaw. >>>> >>> >>> As SIP is usually running over UDP/IP it doesn't take much to produce >>> dropped packets. Dropped packets mean lost audio which means lost data >>> and >>> possible demodulation difficulties for the modems. If you're in an >>> environment where dropped UDP packets don't occur you're in a very rare >>> scenario. >>> >> >> I suppose you are talking about from the provider and not on the LAN? >> > > You certainly can (and usually will) have UDP packet loss on an uncontrolled > LAN.
Then you should be fired for not controlling your LAN. > >> At Equinix in Ashburn VA, I have never had a dropped packet via the >> crossconnect from our cage to Level3's cage. Sub ms pings. Putting >> the primary PBX in Equinix and a 100meg speed for all VoIP calls in >> our out. 100meg DIA and 100meg layer 2 fiber to corporate. > > I have no reason to doubt your claims, but if this is true, then your > arrangement there clearly mitigates the likelihood of UDP packet loss. > Nevertheless, this arrangement is not something that the typical user who > asks "how do I fax over SIP/VoIP" is going to have. Without being very > clear about the environment and explaining the pitfalls of not following > your example exactly, you're not doing them any favors by encouraging them > to attempt it in their environment. I don't care what you doubt or not. I engineered it, Got the contracts signed, provisioned, setup BGP, got all that cleared with the steering committee. I do not assume anything about anyone and cannot define a typical user. That is making as ass out of you and me. I encourage everyone to attempt and test everything! Not put it in production without some reasonable testing. > > For every one user who I've ever heard from saying that they have reliable > G.711 faxing over their SIP channels I've heard from a dozen who don't. Roger That. That is why I advise clients it is not the best way to go. > > Thanks, > > Lee. He came in giving no details about his setup. Now I see it is 1000 phones. I guess you don't care to read threads, and like to jump in the middle not knowing what you are talking about. I said that there is really no good way to handle faxes with Asterisk except with a T1, IAXmodem, and Hylafax. I bought fax for Asterisk when migrating to an all SIP world and it was a dismal failure and Digium didn't even have anyone that could explain any of the stats or problems I had. I paid for it so I didn't have to screw around and finally I just took a refund and a big dent as far as the companies opinion of me. I wanted to try the 1.2 asterisk fork and that other project that came from the fact that Asterisk has deadlock issues and a whole cross platform rewrite has been done. Thanks, Steve Totaro -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users