I am looking for an ATA that has had very reliable results when passing FAX over IP. I was thinking of testing the Cisco (not Linksys) ATA 186 I1, ATA 186 I2, ATA 188 I1. This is what I'm looking for: FAX -> PTSN -> through Asterisk -> ATA -> Fax Machine. I have QoS from PSTN entry to ATA on the network so I can assure precedence. What has everyone out there been using in this type of setup with the most luck? Thanks Curt -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20061114/0f38b529/attachment.htm
Curt Shaffer wrote:> > I am looking for an ATA that has had very reliable results when > passing FAX over IP. I was thinking of testing the Cisco (not Linksys) > ATA 186 I1, ATA 186 I2, ATA 188 I1. This is what I?m looking for: > > FAX -> PTSN -> through Asterisk -> ATA -> Fax Machine. >(a) If you are not running a version of Asterisk that has working SIP jitter buffering (is there such a thing?), then abandon all hope now. (b) We have no experience with the Cisco ATAs, but the Linksys (nee Sipura) SPA-210x is markedly better than the SPA-100x and SPA-200x, probably because they have better jitter buffering (it goes without saying we do not pass our fax traffic through Asterisk). (c) T.38 is the way to go, G.711 a poor and distant second choice (again, Asterisk's T.38 pass-through is far from ready for prime time). g. -- George Pajari, netVOICE communications 604 484 VOIP (484 8647 x102) Open Source VoIP/Telephony Specialists 1 877 NET VOIP (638 8647 x102) www.netvoice.ca www.ip-centrex.ca www.digium.ca www.grandstream.ca www.sipura.ca www.snom.ca
In article <455A69AE.8090608@netVOICE.ca>, George.Pajari@netVOICE.ca says...> (a) If you are not running a version of Asterisk that has working SIP > jitter buffering (is there such a thing?), then abandon all hope now. > > (b) We have no experience with the Cisco ATAs, but the Linksys (nee > Sipura) SPA-210x is markedly better than the SPA-100x and SPA-200x, > probably because they have better jitter buffering (it goes without > saying we do not pass our fax traffic through Asterisk). > > (c) T.38 is the way to go, G.711 a poor and distant second choice > (again, Asterisk's T.38 pass-through is far from ready for prime time).Hi George! You said that T.38 is the way to go. I have problems with T.38 and I don't know how to solve them. Maybe you can help me. I often get this message on CLI: Nov 15 14:56:03 WARNING[2237]: chan_sip.c:3602 process_sdp: Unknown SDP media ty pe in offer: image 31512 udptl t38 What could be the reason and how to solve it? I have Fax machine - Grandstream Handy Tone 386 - Asterisk - my SIP provider Thank you for your time! -- Tomislav Par?ina Lama Computers Split Stinice 12, 21000 Split Tel.: +385(21)270248 Mob.: +385(91)1212148 SIP: tomo@sip.lama.hr e-mail: tparcina#lama.hr http://www.lama.hr