[Asterisk-Dev] zapata, zaptel, GPL etc

[Vinod Sankar]

Hello,

I purchased 2 E1 cards from Digium and am trying to integrate
it into our proprietary commercial VoIP software. I'm very confused
about the licensing requirements for using the appropriate libraries
for this. There is zapata code from zapatatelephony that seems 
to be in public domain, but only available on FreeBSD, and there
is zaptel on linux which is GPL. I'm using linux. Does anybody know 
what libraries are needed so that the VoIP software can simply 'open'
the E1 ISDN PRI voice circuits and 'play' or 'record' voice streams
from and to it ? Can I use these libraries without making my whole
app GPL ? 

thanks,
Vinod Sankar