Hi Justin,
We just launched new security feature that may be affecting your calls.
You may need to whitelist your networks IP address. Go to:
http://www.whatsmyip.org/
Then under Account Settings-> Whitelist IP Address -> Add the IP address to your whitelist.
Our firewall settings will update in 5 minutes and your phones should be able to make/receive calls fine.
Let us know if you have any issues.