I have (3) C2610 routers and (1) Cat 3550 inline power.
If I get (1) FXO and (1) FXS analog ports, can you confirm whether I should get a PSTN simulator in order to be able to play with POTS, gateways and gatekeepers stuff ?
If I have only (1) FXS and (1) FXO, how far can I go in my home lab tests?
You can connect in the same router or another router, ideally you would dedicate one router for your PSTN backbone, this router would have the FXS lines and the IPT routers would have FXO lines. But you can also for example interconnect one FXO port on router A to FXS port on router B, and FXS port on router A to FXO port on router B.
HTH, please rate all posts!