Before revision: Since the difference is often quite small, this problem occurs on long, detailed fax images giving the clocks more time to cause the jitter buffer in the gateway to either underflow or overflow, which is just the same as missing or duplicated packets.
After revision: Since difference is often quite small, this problem occurs on long, detailed fax images giving the clocks more time to cause the jitter buffer in the gateway to either underflow or overflow, which is just the same as missing or duplicated packets.