John Wrote: > Hi Neil, > > Since I don't read Japanese, I cannot say for sure, but it is my > understanding that the D-STAR specification includes the definition of D-STAR > on the Internet. I am not sure dplus and indeed "Hotspot" implements that > protocol (I suspect it does not). If, as I suspect, the UDP packets are > encapsulations of the the D-STAR frames, then it is not analogous to the > traditional VOIP model. > > If you take one of the common VOIP protocols, SIP (session initiation > protocol) for example. The control, e.g. addressing, flow, messaging, etc. > is managed through one data stream and the "voice" using one of the standard > codecs such a ulaw, alaw, iblc, gsm, g.729, ... is sent over a separate data > stream (another IP port) using RTP (real time protocol). The voice portion is > simply the encoded voice. Under D-STAR the voice (AMBE) and messaging (DATA) > are combined, and likely encapsulated with callsign addressing, if not the > whole frame structure over one data stream to a single port. This is > fundamentally different. If we must have an *OIP -- I would propose DOIP for > D-STAR over IP, which incidentally, could also include encapsulated DD frames. > > John - K7VE
I reply: Yes, it seems that way. I'm guessing that hotspot and hotpoint are just 'hacked' versions of the DV Tool somewhat. No idea if the 'data' and DV (voice) are kept together in the same stream or not, doesn't seem to be when you connect to port 20001 or wherever, just one port on the reflector/node IP etc. Will have to play a little more. No RF D-Star around my QTH, so all my working is mobile and rather dodgy trying to set YOUR/UR: to something when driving and want to do something else on the fly. (Or the wheel!) Its still great to be able to connect to reflectors and call up Dongle users via RF on the nodes wherever I am. My work has changed quite a lot recently, so I've been to a lot of extra places, thank god for mobile internet so I can look up what's within range (I hope). My milage IS different now. Where do you 'hang out'? 14C seems really busy every time I connect and can't get a word in edgwise, so I usually stay local and connect elsewhere where its possible to make contact. At least Robin's fixed the fault with the Dongle and double key-ups for now. (Thanks Robin.) Bed time here. 73. Neil. G7EBY. Came into this a bit late really (Year or so ago) so not really 'up' on all the protocols and stuff.
