A.分布式的SIP服務(wù)器 B.FIREWALLS AND VPN GATEWAYS C.FLAT ARCHITECTURE D.E2E管理
A.1Gbps B.2Gbps C.4Gbps D.6Gbps
A.SEAMLESS VOICE HANDOVER B.CIRCUIT SWITCHED SERVICES VIA UU C.COMMON A-BIT INTERFACE D.4D SCALABILITY