Analyzing the incoming/outgoing traffic of my telegram bot hosted on a raspberry pi inside my home network, I had got a trivial doubt.
09:38:13.299379 IP 149.154.167.220.443 > 192.168.1.16.43576: Flags [P.], seq 7171:7954, ack 1798, win 33, options [nop,nop,TS val 1583794963 ecr 1448315541], length 783
09:38:13.303060 IP 192.168.1.16.43576 > 149.154.167.220.443: Flags [P.], seq 1798:2120, ack 7954, win 501, options [nop,nop,TS val 1448318515 ecr 1583794963], length 322
09:38:13.303718 IP 192.168.1.16.43576 > 149.154.167.220.443: Flags [P.], seq 2120:2198, ack 7954, win 501, options [nop,nop,TS val 1448318516 ecr 1583794963], length 78
09:38:13.319200 IP 192.168.1.16.43564 > 149.154.167.220.443: Flags [P.], seq 3271:3595, ack 4613, win 501, options [nop,nop,TS val 1448318532 ecr 1712535163], length 324
09:38:13.319403 IP 192.168.1.16.43564 > 149.154.167.220.443: Flags [P.], seq 3595:4362, ack 4613, win 501, options [nop,nop,TS val 1448318532 ecr 1712535163], length 767
09:38:13.350168 IP 149.154.167.220.443 > 192.168.1.16.43576: Flags [.], ack 2198, win 34, options [nop,nop,TS val 1583794976 ecr 1448318515], length 0
09:38:13.357032 IP 149.154.167.220.443 > 192.168.1.16.43564: Flags [.], ack 4362, win 47, options [nop,nop,TS val 1712541039 ecr 1448318532], length 0
09:38:13.400400 IP 149.154.167.220.443 > 192.168.1.16.43564: Flags [.], seq 4613:5841, ack 4362, win 47, options [nop,nop,TS val 1712541049 ecr 1448318532], length 1228
09:38:13.400434 IP 192.168.1.16.43564 > 149.154.167.220.443: Flags [.], ack 5841, win 501, options [nop,nop,TS val 1448318613 ecr 1712541049], length 0
09:38:13.400843 IP 149.154.167.220.443 > 192.168.1.16.43564: Flags [P.], seq 5841:6151, ack 4362, win 47, options [nop,nop,TS val 1712541049 ecr 1448318532], length 310
09:38:13.400865 IP 192.168.1.16.43564 > 149.154.167.220.443: Flags [.], ack 6151, win 501, options [nop,nop,TS val 1448318613 ecr 1712541049], length 0
The snippet above describes the traffic between the Telegram server and my home-hosted BOT. Outgoing traffic passes through the 443 port but I don't understand how the incoming traffic can pass through port 43357 without any port forwarding on my home router.