[Asterisk-Users] Call-ID and Unique-ID

[Kevin P. Fleming]

Alex wrote:
> 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.