How to get sip message's unique Call-ID in extensions.conf

Can someone please explain, how can i get ‘Call-ID’ field in extensions.conf (see last line in below sip message)

INVITE sip:44444@ SIP/2.0
Via: SIP/2.0/UDP;branch=z9hG4bK621oat1050348m10veo0.1
Max-Forwards: 69
From: "[V] 7033651" <sip:7033651@>;tag=as326617a2
To: <sip:8726645779@>
Contact: <sip:7033886651@;transport=udp>
*Call-ID: 237eebfe4e412e1f215a2ae127a72e53@*


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