if a call is returned to the switchboards unanswered,can the CLI indicate that it is a returned call and not a new call. Client need to be able to identify this so that they don’t irritate their callers by going through their whole introduction again.
Submitted by brian on Sat, 02/23/2013
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The ESP module should work perfectly for you.
Or you could setup a special DID and use the as the CLI for outbound calls and send any calls to that DID to a route the will let the callee know it's coming from that DID