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| All-IP Networks must carry all types of services that were supported by circuit and packet switching networks. |
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| It is very diffcult to manage QoS for such environments |
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| UMTS 組織將網路上風行的應用依時效與品質需求概略分為四大類： |
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| Classes | Examples
| Conversational
| 語音服務 (Voice)，影像電話 (Video Phone)
| Streaming
| VoD
| Interactive
| WWW, Telnet
| Background
| E-Mail
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| It may be easier to support QoS for 4 service classes |
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