H.323 - , ITU-T, , , , . ( ) , , , . SIP (Session Initiation Protocol) 2000 IETF RFC 2543. SIP TCP/IP, H.323. 3Com, Cisco, Ericsson, Siemens . SIP IP- .
30% ( ). IP- , . .
, IP-
: G.711, G.722, GSM0610, G.723, G.723.1, G.728, G.729. G.711 64 /, IP- (, ), .. . - G.729 8 / G.723.1 5.3/6.3 / - . , G.723.1 "" IP-, , Intel, Microsoft Netscape .
IP-
IP- ( ITU-T H.323) , IP-:
n (gateway);
n (gatekeeper);
n (administration manager).
, GateKeeper, - , IP- IP-.
:
n
n
n [1]
IP-, IP-, - .
:
n IP- IP-.
. , pcAnywhere. IP- .
|
|
- , IP- (PBX/PSTN).
:
n PBX/PSTN
n
n PBX/PSTN
n , ( -)
, Gateway, - IP-, IP.
, , , , . , IP-.
1. .. : .- .: - , 2000.
2. . IP- / , 1999, 9.
3. .. IP-/ , 2001.
4. / .. ,
[1] , , API .
IP-, . ( host-based VocalTec, Vienna .) . IP-, . , .