Could anyone explain to me what is the difference between Call-ID and UniqueID of SIP calls, please? Which one could be used as an ID to trace, for example, the status of a call with Manager API and PHP?
The Call-ID is internal to the SIP protocol, and not exposed inside Asterisk (or via manager/AGI). The UniqueID is assigned by Asterisk to the call itself and should be used for tracking the call via the Asterisk interfaces.
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