Cisco Cisco ASA 5515-X Adaptive Security Appliance - No Payload Encryption Guía De Información
The payload type for the NAT discovery payload is 20.
The current accepted payload type of the NAT−D payload is 20. If you look at the debugs on the ASA, you
see:
see:
[IKEv1]IP = 192.168.96.120, IKE_DECODE RECEIVED Message (msgid=0) with payloads:
HDR + KE (4) + NONCE (10) + UNKNOWN (15), *** ERROR *** + UNKNOWN (15),
*** ERROR *** + NONE (0) total length : 232
Here are snapshots from the packet captures:
ASA to phone:
Phone to ASA: