We have setup two SPA3102's in a lab environment to test the ability to extend a fax line from our main office to a remote office over VOIP.
PSTN --------> (FXO) SPA3102#1 -------------LAN---------------> SPA3102#2 (FXS) --------------> FAX
The two SPA3102's are setup with a dial plan between each other so that an incoming call on the SPA1 FXO rings on the FXS port on SPA2. When the FXS station is picked up on SPA2 it automatically dials and picks up the FXO line on SPA1.
Receiving faxes seems to work fine, however when sending faxes the machine gets a fast busy. The only way to get the fax to transmit is to manually dial the fax number VERY slowly on the machine manually.
Right now the setup is over our LAN so quality between the two SPA units should be excellent. Is there any adjustments that should be made?