I am building my first Asterisk box, using Asterisk@home build.
I see FXO cards for ‘good’ prices like $30 per port (but 1 port per PCI slot).
But I don’t see any equivalent pricing for FXS cards. A Digum TDM20B seems to come in around $270.
I need at least 2 FXS ports for my legacy side. And I would hope they can support a standard 5 REN (maybe that is why it costs so much?).
I have looked at various devices like the Grandstream and Supiras, but they only support one upstream provider at a time, and that won’t work for me.
Any recommendations on how to control my costs here?