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The ANI comes over with the call setup, should be used to know who the exchange will charge for the call. This can be blocked against, but since the late 90s al
by downrightmike 8y ago
The ANI comes over with the call setup, should be used to know who the exchange will charge for the call. This can be blocked against, but since the late 90s almost no one wants to send this info because it can be blocked. And it isn't required, with it often being blank. Caller ID comes on the second ring, but this can be set to be whatever you want and it gets just passed along. I've rarely seen ANIs blocked on the telco side unless they were sending a ANI, really spamming and someone reported them.