Brian Capouch wrote: > Geoff Manning wrote: > >>>>> Skype uses wideband-ilbc. >>>>> >>>> >> >> I don't think thats right. I think it just uses iLBC over it's own >> proprietary Voip protocol. >> http://www.skype.com/help/faq/technical.html >> How much bandwidth does Skype use while I'm in a call? >> Skype automatically selects the best codec depending on the >> connection >> between yourself and the person you are calling. On average, Skype uses >> between 3-16 kilobytes/sec depending on bandwidth available for other >> party, >> network conditions in between, callers CPU performance, etc. > > > I don't think that's correct. > > I don't have the link to the Columbia paper where they tried (with only > mixed success) to figure out what all nefarious stuff Skype does > (hijacking port 80 being the most pernicious) but I'm pretty sure they > have figured out that if possible, it will use the (proprietary) > wideband version of iLBC.
BTW, with all this talk about "wideband iLBC", we should probably start using correct terms since iLBC actually stands for "internet Low Bandwidth Codec". So "wb iLBC" is an oxymoron. GIPS has a few proprietary codecs. Probably the one we are referring to is "iPCM-wb", which according to GIPS (globalipsound.com) "...is a wide band codec with extreme robustness against packet loss [that] provides better-than-PSTN quality across ... the public Internet." They also have iSAC which supposedly "...makes VoIP communications possible using a dial-up modem, automatically adjusting transmission rates to deliver better-than-PSTN voice quality." Skype is listed as a customer of GIPS on GIPS' website, but I don't know which codec Skype uses. It must be one of the proprietary ones though. _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
