There are, of course, a few things that could cause you have trouble connecting. Some are basic, but I will mention them anyway.

Wrong IP address. ( I see that you verified prg 916)
Not on same subnet as admin PC. Can you ping the IP?
IP conflict. If you unplug the network cable from the Toshiba, does the pinging stop?
The Community Name must match exactly. Don't post it or ask it to be posted here. It is considered a password.
CIX lockup. Try power cycling the PBX