gtt. 基本例句 医滴 GTT is the procedure by which the destination signaling point and the subsystem number SSN is determined from digits that is, the global title present in the signaling message. 具体来讲,它是利用信令信息中存在的数字,即全局码,来决定目的信令端和子系统的号码 SSN的过程。 wiki.mycreative.com.cn