Elastix is reasonably good at doing fax again as suggested by Bret, Jitter and packet loss is going to hurt your fax. High latency is not a problem but constant changes of latency will be and if your network has latency problem then I would not waste time. We have a solution setup in datacenter with the T1 connected directly next to the Elastix box. And it works like Magic. However doing it in China, we have nothing but all bad luck.. So m SAm
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trixter aka Bret McDanel Sent: Tuesday, February 03, 2009 2:41 AM To: Commercial and Business-Oriented Asterisk Discussion Subject: Re: [asterisk-biz] Faxing with Asterisk On Mon, 2009-02-02 at 10:14 -0800, deva free wrote: > Hello > > Is it possible to have a commercial grade fax over ip solution with > Asterisk? for a fax-email /email-fax business. > > That depends. Jitter and loss are the killers of this, not really latency. If latency was the issue (and I have seen many suggest that it is) then you wouldnt be able to fax with TDM from say NY to Africa, Russia or many other places that faxes routinely go through to. As a result you have to ensure that the bandwidth between you and the provider is good, and this can be really problematic if you have any tertiary providers between yours and theirs. T.38 can help to some degree with this but its not a magic bullet, and its my understanding that the spec is vague (gee just like sip, rtp, rfc2833 and a few others) and so providers tend to do it differently forcing their own interpretation of the T.38 spec, or just inventing their own blatently wrong implementations. As for commercial I do not know what you mean by that, there is the reception of the data, but odds are there is a conversion process to change it from a G3 tiff to say a pdf, and other things, and normal scaling rules apply. In addition, you have issues of what features the faxes in question support, faxes support a variety of features and they negotiate at the start up what each side supports and generally try to use the "best" common feature set, but if you need something in particular you may lose that feature if its not supported. Further, spandsp afaik is still GPL and so the GPL rules apply (ie you cant distribute a system with asterisk that is not GPL, for example the Asterisk Business Edition). Spandsp only matters if you are looking for a "software only" solution and not some hardware based one. There are work arounds that can be used to have a mix of gpl and non-gpl software, for example iaxmodem builds a "license condom" by using a socket to get the data from asterisk and send it elsewhere for processing. Further J2 has a patent on certain aspects of a fax->email solution, you may have to pay them a licensing fee if you do this. > -- Trixter http://www.0xdecafbad.com Bret McDanel pgp key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8AE5C721 _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
