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

Asterisk Asterisk Dialplan
1

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

INVITE sip:44444@44.139.96.77:5060 SIP/2.0
Via: SIP/2.0/UDP 64.33.142.26:5360;branch=z9hG4bK621oat1050348m10veo0.1
Max-Forwards: 69
From: "[V] 7033651" <sip:7033651@64.2.142.26>;tag=as326617a2
To: <sip:8726645779@44.199.96.77>
Contact: <sip:7033886651@64.2.142.26:5060;transport=udp>
*Call-ID: 237eebfe4e412e1f215a2ae127a72e53@10.44.109.49:5060*
2

https://docs.asterisk.org/20/_Dialplan_Functions/PJSIP_HEADER/

3

${CHANNEL(pjsip,call-id)

4

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