recommend low-bandwidth VoIP provider compatible with Obi?
Stewart:
Yes, try G.729 with 30 ms packetization. In the OBi, in the relevant Codec Profile under G729 Codec, set PacketizationPeriod to 30, which will change what the OBi sends. It will also put that in the SDP, requesting the provider to also send 30 ms frames, but they may not comply. Capture some traffic to check.
Is the poor quality on inbound voice, outbound voice or both? Even when there is no other traffic on your LAN?
I suggest that you capture traffic with Wireshark to see what is going wrong. If you're losing packets, a jitter buffer obviously won't help. If it's jitter, it's useful to know how bad it is -- you probably don't want to add one second of latency in each direction.
For inbound trouble, a local capture is all you need. For outbound, unless you can get a trace from a very friendly provider, set up a P2P connection with an associate with a wired Internet connection, e.g. OBiTalk link to his softphone, and have him capture traffic.
For external buffering, there are jitter buffer settings in Asterisk (and I assume other softswitches).
Are you really in the middle of nowhere? For example, could you get cellular data (or voice), by using a high-gain fixed antenna on a small tower? Any fixed wireless Internet providers visible (or nearly visible) from your location? Can you set up a point-to-point wireless bridge to a nearby site where wired Internet is available?
sfzcadmin:
Truly in the middle of nowhere, yes Nearest cellular tower is many miles and a few ridges away.
The inbound quality is fine; outbound is choppy, so that is likely attributable to the unusually bandwidth on the upstream, soon to be fixed with a new modem from the satellite provider.
The bigger issue is getting our total usage down. Even at g.729, we are using a ridiculous amount of bandwidth due to the amount of time on the phone (simple math, right?), so I'm trying to get it down as low as possible so we can stay under our "cap".
I'll implement your suggestions and then post back when I have some data. Thanks again!
Stewart:
Check that silence suppression is on (in the OBi, it's off by default) and that it is working correctly in both directions, by repeatedly refreshing the Call Status page, while only one party, then the other, is speaking. If that's not the problem, make some measurements of your own, to audit the satellite company's meters.
Quote from: sfzcadmin on June 15, 2012, 04:28:23 pm
Truly in the middle of nowhere, yes Nearest cellular tower is many miles and a few ridges away.
Well, at least the air is clean, and you don't have to worry about how you're dressed when you go out to feed the animals.
Good luck.
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