[Asterisk-Dev] Asterisk and GlobalCall

[tim panton]

On 22 Sep 2005, at 08:33, Kristian Nielsen wrote:

> "Kevin P. Fleming" <kpfleming at digium.com> writes:
>
>
>> The fact is that the libraries used as part of the Intel/Dialogic
>> Global Call API are NOT licensed in a way that makes them compatible
>> with GPL software. As such, there cannot exist a channel driver for
>> GPL Asterisk that connects to those libraries, unless Intel chose to
>>
>
> Well, there would be no (licensing) problems in writing a GPL'ed  
> channel
> driver for the GlobalCall API; the source for such a driver would  
> not be
> considered a derived work of the Intel libraries just by accessing a
> published API. However, such a driver would only be distributable in
> source form, not in binary form (since the binary would be a derived
> work of both Asterisk and Intel libraries). That would make it  
> somewhat
> inconvenient to work with.

No, I think it is worse, there is (AFAIK) _no_ published API.
GlobalCall .h files are _licensed_ too. That's what Kevin was saying.

>
> But I am more curious about the technical feasibility of using the
> GlobalCall API to write a Dialogic channel driver. When I worked with
> GlobalCall (a few years ago admittedly), the only way to get audio  
> from
> the card was dx_rec() and friends, and our Dialogic support told us  
> that
> the minimum supported buffer (and hence latency) on that was two
> _seconds_, which is just totally ridiculous.
>
> So has that changed in resent GlobalCall releases, or was support  
> giving
> us bullshit?
>

I did some playing with this for the GJTAPI project, and if you  
substituted
your own custom I/O system (I forget the call), the latency was  
acceptable.
So I think support were wrong - but then again it could be card  
dependent.

>  - Kristian.
>
> -- 
> Kristian Nielsen   kn at sifira.dk
> Development Manager, Sifira A/S
>
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