[asterisk-users] Using asterisk with DSP chips

[Sazzad]

Hi,

I have to use asterisk with some dedicated DSP chips, which will do the
expensive G729 CODEC computing, so that the server processor has minimum
load. I was informed, I've to use GPAK to implement this. So far I've
researched, I've found that, Asterisk uses Dahdi to *talk* to external
devices.

Can you please direct me to references/documentations that clarifies,

   1. The over all architecture of asterisk with dedicated DSP chips,
   i.e., how does asterisk integrates with dedicated dsp chips?
   2. Whether embedded scenario is a must for such development or is it
   possible to use asterisk on server and dsp's through some PCI/Ethernet?
   3. What could possibly be the build process in such scenario? Tools
   i.e., cross compilers etc?
   4. How do asterisk know, that when a call arrives it has to use a
   particular DSP chip for Encoding/Decoding?

The GPAK user's manual states,

The physical layer of communication between the host processor and a G.PAK
> DSP is often dependent upon the hardware design.  This interface can be via
> a host port interface (HPI), shared memory, a PCI bus, Ethernet or any
> other fast data pathway.


So far I've comprehended from the above quotation, it is possible to use
asterisk on a server and DSPs on some remote location (say, not built into
the same board where asterisk is running) . Am I correct?

Thank you very much for patient reading.

-- 
Sincerely,
Sazzad Bin Kamal
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