We were experimenting with pings with a large datagram size (1500 bytes / 1600 bytes) and we were pinging from an ASA to a 7940 ephone. As soon as we executed the commands the phone rebooted. The pings did not arrive. The phone is running P00308000400.
Target IP address: 192.168.10.110
Repeat count:  300
Datagram size:  1600
Timeout in seconds: 
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 300, 1600-byte ICMP Echos to 192.168.10.110, timeout is 2 seconds:
Success rate is 0 percent (0/8)
470762: May 3 21:16:38.856 CET: %IPPHONE-6-UNREGISTER_ABNORMAL: ephone-13:SEP00
112189D28C IP:192.168.10.110 Socket:3 DeviceType:Phone has unregistered abnormal
Ofcourse this is not a major issue, but I guess someone could use this as a DoS attack on someones phone setup.
Anyone else seen this before?