2 panasonic_2002: I think that I understood what do you mean by that, you mean the interconnection between 2 LDK directly without Asterisk, isn't it?
but, i am not searching to connect them directly, I want the interconnction to be via Asterisk. So, it should be via SIP :)
any way, thank you for the help ;)

sorry for long delay.

yes, "networking" in ldk is "interconnection between 2 LDK directly", but generally it work with non-ldk too.

sorry, i don't have experience with voip in ldk - both VOIB and VOIBE cards are expensive and i can't help with ldk programming.

if you know, how program ldk (to send and receive calls via sip) - i can help (or try to help) with asterisk.

thank you edo.
well, we will supoose that every thing is all right from the side of the LDK.
So, i suppose that i should then add the users ,that have already been linked to the LDK, to extensions.conf.
And how will the Asterisk server talk to LDK? I mean what are the parameters that I should modify in SIP.conf so that Asterisk can see the LDK?
thank you edo again