What is port 1720

hello !
i made NMAP on my teltonika modem !
and found that port 1720 , why its open , what his purpose ?
can i closed it ?

Device model and FW version?

model :RUT240
Firmware = 7.6.1

1 Like

Installed 7.06.1 FW on my own RUT240, but didn’t reproduce your issue.

Port 1720 is

H.323 Call signalling (Official)

according to IANA

Maybe a VoIP phone or a similar device which
talks UPnP to the router?

Timelapse Admin

@WuzzerS What’s the output of the following command - netstat -ntulp? Can you see what service is using port 1720?

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