IP电话的互通问题是目前许多人关注的问题，文章就其中的呼叫控制流程和用户接入认证协议进行了讨论。

The interoperation technology about IP telephony is very concerned now. Some aspects, such as call handling procedures, authentication and authorization procedures, are discussed in this paper.

youdao

IP电话的互通问题是目前许多人关注的问题，文章就其中的呼叫控制流程和用户接入认证协议进行了讨论。

The interoperation technology about IP telephony is very concerned now. Some aspects, such as call handling procedures, authentication and authorization procedures, are discussed in this paper.

youdao