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Motorola P25 800 system encryption patching

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rileym
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Motorola P25 800 system encryption patching

Postby rileym » Mon May 22, 2017 7:33 pm

Does anyone know if a Motorola 800 P25 phase 1 trunking system can have 2 talk groups hard or soft patched at either console or trunking controller to allow two talk groups with two seperate aes encryption keys to be patched?

I realize the system would normally single broadcast with two talkgroup id's for a patched trunking talkgroup. This is in a system where two agencies each have their own keys but desire to have seperable (in case of security breach) but secure interop on a daily basis while retaining their own keys, and only one of the two groups radios are flashed for multikey.

Thoughts aside purchasing a flash upgrade for multikey?

Thanks.
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motorola_otaku
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Re: Motorola P25 800 system encryption patching

Postby motorola_otaku » Tue May 23, 2017 12:50 pm

First question I have is, which console platform are you doing this on? MCC7500? 7100? 5500? There is no such thing as a "trunking controller patch" in the 7.x world so it has to be done at the console level.
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515
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Re: Motorola P25 800 system encryption patching

Postby 515 » Thu May 25, 2017 6:03 pm

You'll probably need multi-key capability.

From what I remember, the consoles and subscriber radios would use a different key when the talkgroup is patched to another. Look in the APX CPS under the trunking system's "Secure/Multikey" section down at the bottom of the trunking system's page. You'll see a drop down menu called "Patch Key Select" which tells the radio which key to use when talkgroups are patched.

I guess the thought was to program a "common" key in every subscriber and console position that would automatically be used whenever talkgroups are patched.

I also remember if a console user patches an encrypted talkgroup to a clear one, the calls will go out on two voice channels--one for the encrypted radios and one in the clear. A small message appears at the bottom of the MCC7500 screen warning the dispatcher that they have patched a secure resource to a clear one, or something to that effect.

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motorola_otaku
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Re: Motorola P25 800 system encryption patching

Postby motorola_otaku » Thu May 25, 2017 6:39 pm

All true for a wireline console, however if he's using a MCC5500 with APX or XTL consolettes the system will treat both talkgroups as separate voice calls and use their respective traffic keys.
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wavetar
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Re: Motorola P25 800 system encryption patching

Postby wavetar » Mon May 29, 2017 2:51 am

You can patch them without using the 'patch' key if you set their talkgroups to be 'non-regroupable', but then you utilize two repeaters at each site instead of one.
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