However, existing IP bearer networks still have deficiencies in service bearer and operation. Operators still doubt whether existing IP networks can bear all carrier-grade services.

但是，现有IP承载网络在业务承载和运营上还存有不足，各运营商对现有IP网络能否承载各种电信级业务仍心存疑虑。

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But isolated IP bearer network construction advocators insist that IP bearer networks physically isolated from the Internet should be used to carry carrier-grade data service.

而以KT为代表的隔离ip承载网建设派，则坚持使用于Internet物理隔离的IP承载网来承载电信级数据业务。

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