After the connection is made to the client, the server sends the INVITE message to the client and a provisional response (Trying) back to the client that sent the message.
建立了到客户机的连接后，服务器将向客户机发送INVITE消息，并向发送该消息的客户机回发一个临时响应(Trying)。
After the connection is made to the client, the server sends the INVITE message to the client and a provisional response (Trying) back to the client that sent the message.
建立了到客户机的连接后，服务器将向客户机发送INVITE消息，并向发送该消息的客户机回发一个临时响应(Trying)。
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