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Application scenario SIP-MGCP the simplified ENUM-based call procedure between SIP-based system and MGCP-based system MG: sf.cn T2 3 ENUM query answer 2 ENUM query Simplified Call signal T1 ENUM SIP-based system ENUM query sip:chenbo@cnnic.cn 1 invite:+861058813100 $ORIGIN 0.0.1.3.1.8.8.5.0.1.6.8.e164.arpa. @ IN NAPTR 10 100 "u" "E2U+mgcp:tel" "!^.*$!tel:hrd4/56@sf.cn!" . MGCP-based system Call agent 4 CRCX hrd4/56@tst.cn 5 RINGING T1(ip terminal) |