. , . .
:
PPSTN , ;
PISDN , ISDN;
V5 ( ) , V5;
PPBX ( ) , ;
PSHM , SIP, H.323, MGCP.
ѻ :
PPSTN = 5 /, PISDN = 10 /, PPBX = 35 /.
PSHM PPSTN. PV5 .
, , :
(1)
L , .
, , .. , , ISDN, .
, , . , .
, SIP 10 . /, 8 . /, 1,25.
, CALL :
(2)
, Q.543 .