El Miércoles, 4 de Enero de 2006 12:28, tim panton escribió: > On 3 Jan 2006, at 19:10, Francisco Pérez Botella wrote: > > Hi. > > > > > > I will have to manage From asterisk to clients IP-phones, so biefly > > the idea > > is to multiplex voip flows in large packets and multicast them from > > asterisk/AP to client stations. flows from client stations to asterisk > > gateway go unicast. I wonder how iax2 protocol will be good for > > multiplex > > (trunk) and multicast ?? > > Hmm, it won't be easy. > The IAX protocol is not multicast aware, so it is expecting a single > ack to each > full frame. You will have to do quite a bit of work on the IAX > implementation > for it to do the right thing in that area. I see, maybe I could redirect at network layer unicast-->multicast addresses/group and give back a "false" single ack at that point. On the other side (client side). I need some like a "virtual trunk" where each station recieves the full frame and "stealth" the payload it needs for the user/phone(s) it serves. I could at client station redirect traffic from multicast to unicast interface address and serve the full frame to iax2 at client station, silently dropping the acks they give back.
> > I'm also not sure I see the advantage of multicast, given that normally > phone calls are 1 to 1 connections, (except conferences I suppose). That maybe true for wired but wireless in infraestructure mode there's a point of distribution (the AP) that even can police and pool in a pseudo TDM, I mean all the traffic in the subnet is going to pass trought that point > Is it a packet size problem ? It's a capacity problem first, it's an avoidance of collisions too. wireless is a shared medium (radio) and minimizing overhead without latency penalty will be important. I think that in a radio system broadcast is for free capacity and overhead is not. > > http://www.westhawk.co.uk/ -- Francisco J. Pérez Botella _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users