How to implement iSCPC on iDirect 5100

Yes, you will need a minimum of a router on each remote site, and depending on what iDS/IDX you are using, you will need line card or satellite router at the hub side.  The setup in the software is pretty straightforward.  Just ensure you get iDirect's that are capable of iSCPC.  (as you mentioned the 5000 series in your post).

With that many sites, why are you going iSCPC and not TDMA star topology? Are you looking for dedicated BW?  Lack a Hub infrastructure?

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It should be possible now for one site to communicate with another site, via the teleport hub. Check with your service provider.  There will be delay due to the double satellite hop. Try hard to put up with this as the mesh alternative is expensive and complicated.

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The star hub TDMA solution will be cheaper if the communications are only for a short time each day.  If you really want dedicated mesh connection, with direct site to site connections, it will be expensive.

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I think that is what you have now.

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In theory, if you need dedicated connections between say 30 sites then each site needs 1 transmit modem and 29 receive modems, all SCPC.  Very expensive and needs 30 carriers on the satellite.  You also need own beam to own beam transponder connectivity so you can see your own transmissions.

If the need is for intermittent phone calls from site to site consider Comtech CDM-570 plus dual or quad demods (CDD-562 or CDD-564) at each site.  Each site might then make up to 3 or 5 simultaneous calls direct to other sites. This is called demand assigned multiple access or DAMA.  Takes about 2 seconds to set up a call with Vipersat management software. If a site has simultaneous phone calls with many sites then that site might have more quad demods. Equip each site according to the max number of calls to different sites.

I don't know if iDirect iSCPC can be configured to provide a DAMA system, for intermittent phone calls between sites (mesh mode).

Best regards, Eric.