요약 I. 서론 II. VoIP 관련 표준 1. VoIP 표준관련 IETF 조직구성 2. IP Telephony(iptel) 3. Media Gateway Control(megaco) 4. Multiparty Multimedia Session Control(mmusic) 5. PSTN and Internet Internetworking(pint) 6. Service in the PSTN/IN Requesting InTernet Service(spirits) 7. Session Initiation Protocol(sip) 8. Signaling Transport(sigtran) 9. Telephone Number Mapping(enum) III. 결론 참고문헌