[asterisk-users] Do i need install Dahdi or libpri ?

[Zhang Shukun]

hello,all

there is a AudioCodes Mediant 2000 out there. i want to realise ip to
PSTN and PSTN to ip connection.

after some configuration on AudioCodes Mediant 2000, PSTN to ip
connecttion works.

next ,i want to dial from asterisk to PSTN now. i have see the sample
in the extensions.conf relevent to PSTN as follow:

; If you are freely delivering calls to the PSTN, list them here
;
;exten => _1256428XXXX,1,Dial(DAHDI/G2/${EXTEN:7}) ; Expose all of 256-428
;exten => _1256325XXXX,1,Dial(DAHDI/G2/${EXTEN:7}) ; Ditto for 256-325

but above shows something about DAHDI card.

my question is:

a, Do i need install DAHDI or libpri in my system?
b, how to write in dialplan to realise connection to PSTN.

That's    PSTN----->AudioCodes Mediant
2000------->IP(asterisk)--------->AudioCodes Mediant 2000
---------->PSTN

                        ?

Thanks very much!
-- 
Best regards,
Sucan