[Asterisk-Users] Leadtek BVA8051 / Sipphone.com CallInOne with Asterisk?

[Jerry Glomph Black]

I have a lot of experience, all of it pretty good, with various Sipura products, 
Grandstreams,  Zultys, IAXy, and numerous SIP/IAX soft phones connecting into 
Asterisk as clients.   Good sound quality, great reliability.

I've tried two of the units named in the subject line, and frankly I'm 
frustrated.   Calls usually start out OK, but within a brief period the sound 
goes totally to Hell.  Sounds like the packets are being reassembled out of 
order, because there is a regular candence to the garbling.  Problem is almost 
always on the receiving end, the distant party on the call seems to get OK 
audio.

Most annoying is that when I log the device directly into a VoIP provider (have 
tried FWD, Stanaphone, and Sipgate.de) IT WORKS FINE!

I've tried asterisk boxes on the local LAN, and thousands of miles away. 
Asterisk versions from 0.7.2  to 1.0.3.

Results have been consistently flaky, I've tried flash upgrading, makes no 
difference.   Have tried all sorts of config tweaks on the phone as to buffer 
size, etc.

Google has almost NO info on these things, they have one nice feature which is 
easy autoswitching between POTS and SIP calls in both directions.

Any experience or hearsay out there in Asterisk land?