"I have found that using the voice control on the iPhone to dial is much faster/easier than using the voice control of the LEAF. I can simply hold down the iPhone button and the voice control from the phone automatically connects to the handsfree system of the LEAF. I then command,"Call. Joe. Smith. mobile." and it starts the dial. I find this much easier than wading through all the prompts on the LEAF voice command system (even with the two-button-press trick). Also, the iPhone voice command will even automatically lower the music in the car once the button is pressed on the phone."
Em: http://www.mynissanleaf.com/viewtopic.php?f=36&t=3273