I am having call manager 8.0 with cisco 2900 voice gateway, cisco mcs 7800(subscriber & publisher). cyberoam CR300ING firewall.It is configured for one location with private IP, it wont have outside access. Now i want to configure 7942 ip phone to us...

Hi, I am having call manager 8.0 and 7942 ip phone at office, and i want to use this phone from my house to connect to my call manager. can you guide me how to do this