The ACK request needs to be configured just like the INVITE request created previously.
ACK请求需要像前面创建的INVITE请求那样配置好。
UA1 acknowledges the 200 OK response by sending an ack request to UA2, where the call was forwarded.
UA 1通过向ua2发送一次ack请求，来确认响应200OK。
UA1 acknowledges the 200 OK response by sending an ack request to UA2, where the call was forwarded.
UA 1通过向ua2发送一次ack请求，来确认响应200OK。
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