It could be one of several things, but yes, all wires must be connected on the RJ12. A standard
telephone cable will not work.
Make sure that you have the jumper set for 9v in the control RRC and an adequate power supply.
If network related, make sure that SIP ALG is turned off in the router and try turning off the router's
firewall.
73,
Mitch DJ0QN / K7DX