[Asterisk-Users] general install??

[Nathess Japan]

Need to work out if I can use Asterisk as a software PBX or not?

I reside in Japan and my office has a ISDN line with 2 numbers.
I am currently using analogue phones which are connected to my router(yamaha RT 57i) which has router/Voip/VPN functions.
So my ST line is connected to my ST port of the router and tel lines are connected to the analogue ports(2)

Now I am moving to a bigger office and require a pbx.
What I want to know can is can I configure a pbx using Asterisk as all the hardware I saw didn't seem to support ISDN?

Also I see I may have two options 

1. Leave the tel lines connected to the router and just run asterisk as a software solution that communicates over the lan with my router for incoming and outgoing calls.
Although not sure if this can work????

2. Connect my tel lines to the computer running asterisk and do standard config. Can this work when my line is ISDN???

Please give me an idea how and if I can proceed.

Thanks
Matt
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