Dear Amit,
Whatsapp uses TCP 443 (HTTPS) to pass the majority of the connection traffic but it also uses TCP 80 (HTTP). If voice is used, then ports 4244, 5222, 5223, 5228,50318, 59234 & 5242 are used.
UDP Ports: 34784, 45395, 50318, 59234.
You need to intercept this port on proxy and need to allow on Firewall .
BR
Aboonaim
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