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。
Send an immediate ACK to the customer confirming the request and supplying a confirmation number.
向客户发送即时的ACK，确认请求并提供校验码。
Send an immediate ACK to the customer confirming the request and supplying a confirmation number.
向客户发送即时的ACK，确认请求并提供校验码。
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