What does "caller ID" do in a SIP environment?

In a SIP environment, caller ID serves to identify the incoming call number to the recipient. This feature allows the person receiving the call to see the phone number (and potentially the name) of the caller before they decide to answer. This identification helps users manage their calls more effectively, enabling them to prioritize important calls and screen unwanted or unknown callers. It plays a crucial role in enhancing the user experience by providing valuable information right at the moment of call reception.

The other options describe functions that are not associated with caller ID. Blocking incoming calls is a separate feature typically handled by call management settings. Recording calls is an entirely different capability that involves capturing audio for later playback, which is unrelated to caller identification. Managing call routing pertains to directing calls to specific agents or departments, which is a distinct operational feature rather than one related to identifying the caller.