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This solution assumes that your VoIP client uses SIP and no encryption.

You need to capture the SIP traffic between the VoIP clients and the local PBX / cloud server to trace that number. If you want to trace it from one VoIP client only, you can restrict the capture to the clients IP address to reduce the ammount of data.

To find the call for the marked number, you can use the display filter

sip.r-uri.user contains "967734027597"

If you want to capture the audio part as well, you need to capture the RTP traffic too.