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基本INVITE流（图2）让 user@ibm.com发起对 user@example.com 的呼叫。
This basic INVITE flow (Figure 2) has user@ibm.com initiating a call with user@example.com.
youdao
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基本INVITE流（图2）让 user@ibm.com发起对 user@example.com 的呼叫。
This basic INVITE flow (Figure 2) has user@ibm.com initiating a call with user@example.com.
youdao