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目前来自不同厂商的电话服务网关彼此间并不能够互操作。对于那些自己拥有IP电话网络并在此网络上运行相应业务的公司来说,缺乏互操作性将使消费者在不同网络之间的通信变得非常困难,另一个困难是月末记帐时跟踪其它服务供应商也存在问题。 ITU(国际电信联盟)正对H.323标准进行修改,准备将这一为视频会议应用而创建的标准应用到电话服务网关中。然而这一努力尚未最终完成。那么目前厂商和运营者是如何处理这一问题呢?公司创建他们自己的IP电话网络时并不会关心这一问题。只要话音存在于他们的专用网络中,就可以对该次呼叫进行收费。使用来自单一厂商的电话服务网关也不会出现互操作性问题。但对ISP和CLEC,(具有竞争关系的本地交换运营商)以及电话公司等服务提供商来说,就陷入了进退两难的境地。对受互操作性与付费问题所困扰的电话服务提供商来说,依附于某个超级服务商可能是目前
At present, telephone service gateways from different manufacturers are not interoperable with each other. For companies that have their own IP telephony network and run the appropriate business on this network, the lack of interoperability will make it very difficult for consumers to communicate between different networks, and the other difficulty is tracking others at the end of the billing period Service providers also have problems. The ITU (International Telecommunication Union) is making changes to the H.323 standard in preparation for applying this standard created for videoconferencing applications to the telephony gateway. However, this effort has not yet been finalized. So how do the current vendors and operators deal with this problem? Companies do not care about this when they create their own IP telephony network. As long as voice is present in their private network, the call can be billed. There is also no interoperability issues with using phone service gateways from a single vendor. But for service providers such as ISPs and CLECs (rival local exchange carriers) and telephone companies, it is in a dilemma. For telephone service providers bothered by interoperability and payment issues, being attached to a super service provider may be the present