Media Gateway (MGW, ) , .
, . , IP/ ATM IP/ ATM. NGN, .
call-, IMS MGCF(Media Gateway Control Function), . 3GPP call- S-CSCF (Serving Call State Control Function). call- , MGCP (Media Gateway Control Protocol), Megaco, H.248. IP-, . call- , . , call- IP-, . call- . () RTP , .
, , (. ), DTMF MRFP ( ) IP IMS 3GPP, SIP. , . IMS MRFC (Media Resource Function Controller), Cable/MSO Application Manager, NGN Application Server. NGN ( ) , . ( ) / . Call- ( ) 3GPP IMS S-CSCF, Cable/MSO CMTS.
SIP , MGCP H.248.
, , MGCP H.248 . SIP , . SIP , SIP , , SIP . . Call-, , , , DTMF, -, SIP MGCP/H.248. IVR, , VoiceXML, ASR, TTS, -, . , -XML VoiceXML- SIP.
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SIP , DNS SRV , SIP- , , MGCP H.248 . SIP , MGCP H.248, SIP IP .
-:
Trunking gateway(TG)
IP-, -
( ).
SG,
7;
Voice over ATM gateway (VoATM GW) -,
Trunking Gateway;
Residential gateway (RG) , IP- -
: , xDSL
. (12) -
;
Access gateway(AG) IP--
-
,
,
(i);
Network Access Server(NAS) IP- ;
Business gateway(BG) -
IP- c -
, , DSS1.
:
:
[2,3,6]