[chan-capi-users] New version of ISDN4BSD and CHAN_CAPI available

[Armin Schindler]

Please don't cross-post your announcements. One mailinglist is enough.

Armin

On Wed, 19 Apr 2006, Hans Petter Selasky wrote:
> Hi,
> 
> 
> A new version of ISDN4BSD and chan_capi for Asterisk is available. Please see:
> 
> 
> http://www.turbocat.net/~hselasky/isdn4bsd
> 
> And:
> 
> http://www.turbocat.net/~hselasky/capi4pbx
> 
> 
> Some news:
> 
> There will be support for HFC-4S/8S in not very long. I am currently awaiting 
> hardware to do some testing. The driver is already in the sources.
> 
> Many people are starting to use Asterisk and I4B in NT-mode, for their main 
> home PBX. This works pretty well. The only problem so far is when bridging 
> modems and faxes, which do not always succeed. To make such devices work 
> better, I4B now supports line interconnect through /dev/capi20. Currently 
> only HFC-E1 and HFC-4S/8S based cards will have support for that. Line 
> interconnect must be configured using "isdnconfig" before it works. The big 
> problem is called echo cancelling. To save money, telephone manufactureres 
> often let the network side do this part, in other words I4B. Doing echo 
> cancelling in software is a very CPU intensive task, so instead of performing 
> echo cancelling, "chan_capi" can perform echo suppression, which is easier 
> and sounds perceptually the same. Currenly my version of "chan_capi" has a 
> brand new echo suppressor, that even has a white noise generator for your 
> comfort. The echo suppressor allows faxes to pass through, but not duplex 
> modems. In NT-mode, I4B seems to be stable. That means it should not crash 
> the connected PBX, due to software bugs and memory leaks.
> 
> Have fun.
> 
> --HPS
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