Your DNS has issues!
c:\>ping voip8.acanac.com
Pinging voip8.acanac.com [66.49.255.53] with 32 bytes of data:
Reply from 66.49.255.53: bytes=32 time=16ms TTL=58
Reply from 66.49.255.53: bytes=32 time=17ms TTL=58
Reply from 66.49.255.53: bytes=32 time=16ms TTL=58
Reply from 66.49.255.53: bytes=32 time=17ms TTL=58
Ping statistics for 66.49.255.53:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 16ms, Maximum = 17ms, Average = 16ms