> Now, as we move forward it's time to start the thread on > H.323 VOIP. We are in need of assistance and advice on using H.323 > under Linux to place and receive Internet phone calls. We also > need help from anyone with experience using the Voicetronix OpenLine4 > computer telephony card for originating and answering POTS calls. > Extra points for anyone familiar with the Laos telephone call > progress standards (busy, dial tone, ringing signals).
Currently there are no SIP-based services that provide PC-Phone calling from linux. Nada. None. There *is* one H.323 based service: microtelco.com using GnomeMeeting. Disclaimer: I have nothing to do with microtelco anymore, though I did design the first version of the service and I still own some (non public) stock in Quicknet. I've not been with them for almost 3 years though. The OpenH323 library will probably make you crazy trying to get it down onto a small CF - it has a huge footprint on disk and in memory. But, it's had a lot of bang time and most of the bugs are out of it most likely. You are going to want to get hardware support for G.723.1 voice compression if you plan on using microtelco. Quicknet sells cards that do this for reasonable prices - inlcuding pcmcia cards. You may want to look at the LineJACK too as an alternative to the Voicetronix cards. See www.linuxjack.com. If you are going to roll your own termination into the PSTN, then you can get some freedom. Please look into the open source patent free Speex codec (www.speex.org). Check out the Free World Dialup (http://www.pulver.com/fwd/) - it's a SIP proxy service that might let you do net only calls if both parties are on the net with the right gear. Greg -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
