1。NGN以开放性，分布性，综合性为主要特征。NGN通过业务和呼叫控制分离，呼叫控制和承载网络分离来实现相对独立的业务体系。
•**Centrex Style Features **
**Call Waiting / Multiple Calls RFC 3261 **
**Hold RFC 3264 **
**Transfer RFC 3515 / Replaces **
**Conference RFC 3261 / RFC 3840 **
**Message Waiting RFC 3842 **
**Call Forward RFC 3261 **
**Park RFC 3515 / Replaces **
**Pickup Replaces **
**Do Not Disturb RFC 3261 **
•
Call Coverage **RFC 3261**
•**Boss/Admin Features **
**Simultaneous Ringing RFC 3261 **
Basic Shared Lines Dialog pkg (stable) / RFC **3680 **
**Barge-In Join (ready) **
**“Take” Replaces (ready) **
**Shared-Line “Privacy” Dialog pkg **
**Divert to Admin RFC 3261 **
**Intercom URI convention **
•**Attendant Services **
**Auto-attendant RFC 3261 / RFC 2833 **
**Attendant Console Dialog pkg **
Night Service RFC 3261** **
NAT/FW Traversal
•**SIP **
**Symmetric Response—RFC 3581 **
**Connection Reuse—SIP WG ID **
**Session Policy—Requirements done **
**Globally Routable URIs—IESG Review **
•**Media **
**STUN—RFC 3489 **
**TURN—Individual ID **
**Protocol-specific Relays **
**ICE—to become an MMUSIC WG ID **
**B2BUAs with Media **
•**Putting it all together **
NAT scenarios—SIPPING WG ID
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