As described, you would need two FXO ports and two PSTN lines.

Alternatively, you could use one FXO port, one PSTN line, and an
outbound connection to a VOIP provider using SIP or IAX, if you have
network bandwidth available for that. Your setup and fixed recurring
costs would be lower, but whether or not that's cheaper overall will
depend on the volume and destination of outbound calls you anticipate.

-- 
Greg Broiles, JD, EA
[EMAIL PROTECTED] (Lists only. Not for confidential communications.)
Law Office of Gregory A. Broiles
San Jose, CA
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