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Verify that the above information was properly stored in the radio by viewing it using the 
keyloader.

This section discusses Radio Over The Air Rekeying (OTAR) capabilities for the UCM 
Equipped 5300 ES.

The OTAR capabilities of the SEM-equipped 5300 ES mobile are as follows. Refer to 
Section Section 9 for more version information.

• Up to three keysets are used and it is assumed all three are always present.Keyset IDs 1 

and 2 are for TEKs and only one is active at a time. Keyset ID 255 is for KEKs and is 
considered active all the time

• Each keyset can have up to 128 keys. However, 16 or less are normally used. 

• AES encryption is supported, but not currently available with OTAR (future availability 

is planned).

• One individual RSI and it is usually initially the same as the P25 Unit ID.

• One group RSI (usually initially “0”).

• One KMF RSI (usually always 9,999,999).

The following KMM Message IDs are recognized by or sent:

CHANGE RSI

0x03

CHANGE RSI RESPONSE

0x04

KEYSET CHANGEOVER

0x05

KEYSET CHANGEOVER RESPONSE

0x06

DELAYED ACK

0x07

HELLO

0x0C