IP Telephony

Hi,
I want to Configure IP Telephony in My LAN Using VoIp Devices called Linksys PAP2.

LAN Network IS : 10.10.255.1/29.

IF i will assign IP ( 10.10.255.2) to one PAP Box & IP (10.10.255.3) to second PAP Box, Can i Dial from One box to another by configuring IP Telephony in Mikrotik.

PLease Suggest. This Just for Internal communication in LAN.