After the initial INVITE, this application will be called on every subsequent SIP message.
完成初始invite后，将针对每个后续SIP消息调用此应用程序。
This message flows through each of the network elements that the initial INVITE came over.
此消息将通过初始INVITE 所经过的每个网络元素。
This message flows through each of the network elements that the initial INVITE came over.
此消息将通过初始INVITE 所经过的每个网络元素。
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