For four analog ports, the correct card would be either the TDM410, for PCI, or the AEX410, for PCI-Express.
You’d want to get the card, dependent upon your bus type, bundled with four FXO modules. That’d be either of the following two part numbers:
1TDM404EF - for PCI, bundled with the hardware-based echo cancellation module (highly recommended)
or
1AEX404EF - for PCI-Express, also bundled with the same hardware-based echo cancellation module.
The product base models are a TDM410 or AEX410 - these are four port modular interface cards. They themselves are not bundled with the FXO capability - we modularize that.
The 1-level part numbers I provided are the SKUs associated with the specific bundlings you’d need for the telephone capability (four analog lines) that you’re after.
For 2:
I’d go ahead and test that functionality prior to purchasing the card. You don’t need PSTN lines to get a call from an H.323 phone to Asterisk or vice-versa.