I have tow Office
Green Office - Head Office
Red Office - Branch Office
in green office I have more than 12 PSTN line I used 10 line for the green office, the branch (Red office) the don't have any connection except WiMax Point to point Network .
its impossible to pull another cable for red office because geographic problems, and permitting procedures.
To use the same network design for both network and telephone line using additional modem or router..
they need to be tow line from PSTN for tow deference users.
the phone should be analog-set for tow users they can use it as direct lines
without any connection for BPX or IP Telephony.
what is the modem or router should be used ?
what is the configuration if its required?
you can see the image below to understand more about the problem .
for more information just post .