On 09/03/2012 21:46, Steve Strobel wrote: > On Fri, Mar 9, 2012 at 11:19 AM, Bruce Perens<[email protected]> wrote: >> On 03/09/2012 09:49 AM, Steve Strobel wrote: >>> The company I work for is in the process of designing a new VoIP device >>> for a very-low bandwidth application. >> You don't really mean the "IP" part of VoIP, do you? Or do you have a >> strategy for coping with the fact that headers will be much larger than >> data. > In some (but not all) cases the data will be sent over IP. But we can > afford quite a bit of latency, 500mS or more in some cases, so the > header overhead can be similar to the payload size even with a > low-bandwidth codec. In other cases we don't use IP, but that is > another subject entirely... > >
I'm also at the evaluation stage of whether we could use codec2 for voip over (expensive) satellite services. The latency of these satellite services are in the 1,000ms range, so the thought of adding say 120-250ms of latency is really within the measurement error. Additionally at least one of the satellite services I'm thinking of supports header compression RFCs which brings the overhead down to 1-4 bytes (at least if I have read the RFCs correctly? RFC2507 + RFC3095) I'm more interested in developing an Asterisk module (with variable frame size) so that we could experiment with the feasibility of this. I could be interested in sponsoring: - Asterisk module (since it will otherwise take me ages to get round to coding - doesn't look terribly tricky though) - Codec optimisation in the presence of background noise, eg used in a vehicle, plane or ship Ed W ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
