All cabling on Cisco voice cards is straight through from the port to the device. RJ11 has 2 pins, for tip and ring. That's blue and white/blue. RJ45 has 8 pins, but if you want to stick with the 568B wiring standard on the RJ45 jacks,you would use this.
Blue: RJ11(pin1)----RJ45(pin 4)--------(pin4)RJ45-----(pin 1)RJ11
White/Blue: RJ11(pin2)----RJ45(pin 5)--------(pin 5)RJ45-----(pin 2)RJ11
If you actually have RJ14 jacks (4 pins), its pins 2 and 3 (the middle pins) which are used. If it is RJ25, it's still the middle pins, which would be 3 and 4.