Ntt Flets PSTN gateway

[Andriy]

Hi everyone.
I live in Japan.
I am looking at connecting my existing Flets NTT Hikari Denwa (optical fiber) phone to my existing 3cx setup (hosted in cloud by 3cx).

My questions are:
1) is it possible to connect a gateway if my phones and gateway is in my office, while 3cx setup is in Cloud hosted by 3cx?
2) what gateway should I use? Will Patton SmartNode SN4112 be ok? How do I find out what type of PSTN network I am using and how to match the gateway that will work with it?

thank you

 

[Andriy]

I see. I guess i need to learn what wireshar is

 

[leejor]

It's a network analyser, that allows you to to see exactly what is happening (what is being sent back and forth), on your network. It includes tools specific to the SIP protocol.
https://www.wireshark.org/

 

[Andriy]

Thank you.
Will take a look at that. Does it also show what port numbers are used?

 

[leejor]

There are a number of sites with information on using Wireshark with SIP (and 3CX specifically), if you do some searches.

https://www.3cx.com/blog/voip-howto/sip-traffic-capture/

 

[Andriy]

Thank you leejor,
I will start learning about Wireshark