I have three * servers that all talk to each just fine, and all talk to other * servers (like NuFone, VoicePulse, etc.). I have hard-phones connected to Sipura SPA-2000s on two of the * servers via a local network connection. The third * server only gets connected to remotely, both with IAX and SIP softphones, and with a "roaming" Sipura with hard-phones.
The setup works well. All of the * servers communicate exclusively with GSM between themselves (and also to NuFone and VoicePulse). The quality is pretty good. The "local" hard phones are using g711 uLaw (since I think that the X100P cards I believe use uLaw by default as well, but I could be way off on that assumption). Codec transcoding from uLaw to GSM seems to work just fine.
From a couple of people who post regularly on this list, I have heard that they have great success with iLBC (and some with Speex as well). I think that NuFone prefers iLBC as well, though it works remarkably well for me with GSM.
I did some experiments in forcing my * servers to communicate with each other only with iLBC. When I do that, and can see that they are indeed using iLBC, the quality is horrible. There is long stutter, like every sound is being "stretched" out.
I purchased g729 licenses from Digium for all three servers as well. Using g729 on the Sipura devices yielded no better quality than the built-in g726. However, when I made two * servers communicate only with g729, the quality was marginally better than iLBC, and ridiculously worse than GSM. This was surprising to me.
All of this is with a very recent cvs checkout of *, done this past Monday the 22nd I believe.
Last point is that if I turn jitterbuffer on (with =yes), then I never hear _any sound_ whatsoever, but there are _no errors_ on either side of the channel. I can see on the CLI that voicemail prompts are being played (for example), but I can't hear anything on either side. Turning jitterbuffer=no immediately restores sound, but the quality only sounds good with GSM.
What I don't understand is how some people have success with iLBC, and I don't. I also noticed one or two posts from people that claim that GSM isn't working for them, yet it works really well for me. Are there any settings that I am unaware of (other than the standard "allow/disallow" directives) that I should be tweaking to make these other codecs work as I understand they should?
P.S. One last piece of voodoo, just if anyone knows the answer to this. On occasion, I use DIAX to connect to the remote * server. It works very well, and is the best of the IAX softphones (IMHO). Yesterday, it was working just fine. Today, from a different location (both yesterday and today behind NAT, just from different networks), it connects fine, but I have zero sounds and zero errors. There were _no_ changes to the server or the software setup in between.
In the past, I have had trouble using X-Lite to this particular * server. Today, when DIAX wasn't working (neither was iaxcomm, it's not a specific DIAX problem), I tried X-Lite again, and it worked flawlessly...
The last bit of info on this is that one of the other * servers is on the same lan as the DIAX client, but on different machines. Both are coming from the same NAT router though. The * machine is in the DMZ, so all packets that are sent to the public side are routed directly to *, and that part works perfectly. I don't know if DIAX is clashing with * packets, but I know this has worked in the past (though it's been 2 weeks since I've tried, and I did cvs up the * server since it last worked...).
Thanks in advance to any brave soul who tackles some or all of these questions/issues! :-)
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