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How "Private" is a "Private Call"

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gs_new

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Other than those of us that have a GRE 500 or other scanner capable of listening to a "Private Call". Is it possible for anyone on the system itself to listen to these calls.

IE, could the system administrator of the radio system listen in?
 

C138NC

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Mmm ill put in my 2 cents, since most walkies are DTMF and telephone interconnect... no its all private just like a cell phone unless your scanner picks em up which is rare since Nextel uses what? 800Mhz as well? But i could be wrong :D
 

zz0468

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gs_new said:
How "Private" is a "Private Call"

Not very.

While the regular system users can't listen from their assigned radios, there's plenty of ways the system administrator or technical staff can listen if they really wanted to.
 

ILMRadioMan

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Ditto,

Remember, as you stated, this doesnt include scanners, or programming each repeaters transmit freq in conventionally.

This can also be done with P25 systems.
 

KG4DZA

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Ditto,

Remember, as you stated, this doesnt include scanners, or programming each repeaters transmit freq in conventionally.

This can also be done with P25 systems.

Correct. I've done this. Additionally, many public safety radio systems are recorded using radios tuned to each of the repeater transmit frequencies so, even if someone doesn't hear you real-time, if they suspect something funny going on they can go back and listen later.
 

davidbond21

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Mmm ill put in my 2 cents, since most walkies are DTMF and telephone interconnect... no its all private just like a cell phone unless your scanner picks em up which is rare since Nextel uses what? 800Mhz as well? But i could be wrong :D

I don't think you're understanding what is meant by "Private Call" in this context. They're talking about a direct radio to radio connection on a trunking system which allows the two users to converse outside of a talkgroup. I don't think there's any way you, as an actual radio user on that system, can listen in without being a party to that call. DTMF/phone interconnect have nothing to do with it.

And I hear the juiciest stuff on Private Call where I am with my PSR-500, with great frequency. Any expected privacy on an unencrypted radio transmission should be rethought.
 

C138NC

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I don't think you're understanding what is meant by "Private Call" in this context. They're talking about a direct radio to radio connection on a trunking system which allows the two users to converse outside of a talkgroup. I don't think there's any way you, as an actual radio user on that system, can listen in without being a party to that call. DTMF/phone interconnect have nothing to do with it.

And I hear the juiciest stuff on Private Call where I am with my PSR-500, with great frequency. Any expected privacy on an unencrypted radio transmission should be rethought.

Oh ok i was just a bit lost.

We have that on all of our radios but they were disabled so that trunking would not be brought down or how ever it was explained to me when i asked about it
 

ILMRadioMan

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Well you have to remember that even though it isnt on a talkgroup, it is still on a trunked repeater.

The repeater itself operates the same, however only you and the other radio can hear.

So if someone were to be watching repeater operation, or listening conventionally, it wouldnt seem any different.

But the reason many places disable it, is because its 2 people taking up a whole repeater.

And when you have smaller ~5 channel systems with 1 being CC, that 1 repeater being used for just those 2 people can have drastic implications.
 

Jay911

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And when you have smaller ~5 channel systems with 1 being CC, that 1 repeater being used for just those 2 people can have drastic implications.

We had a system like that here until a year or so ago. 3 frequency MPT1327 system.. two people doing "direct" calls (private calls) on one freq.. another person playing with phone patches on the other freq.. no room for Fire or EMS comms!

Of course that could have been rectified by proper system configuration, but yeah.
 

Seadoo

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Yes you can listen in, does not matter if it is a private call or regular 2 way radio communications. The radios still use frequencies on the system. only way you couldn't listen in is if they were using encryption.
 

ILMRadioMan

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Yes you can listen in, does not matter if it is a private call or regular 2 way radio communications. The radios still use frequencies on the system. only way you couldn't listen in is if they were using encryption.

Yes well the original question was: Is there a way to do it, other than scanners or conventionally.

To which the answer is: No.
 

ILMRadioMan

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If you have access to the repeaters/DIUs and a handset, you could... but that might be overkill... ;)

man-pulling-hair-out-2.jpg


;)
 

KG4DZA

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If you have access to the repeaters/DIUs and a handset, you could... but that might be overkill... ;)
It should also work if you have the correct encryption key loaded on your radio. I've monitored traffic on encrypted talkgroups by listening to the repeater in conventional mode with the correct encryption keys on my radio. This is probably overkill, too.
 

ajpritch

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You can listen with a Motorola radio assuming you have access to CPS and the system key for the system which is usually tightly guarded by the system admins.
 

ILMRadioMan

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You can listen with a Motorola radio assuming you have access to CPS and the system key for the system which is usually tightly guarded by the system admins.

Incorrect.

Again....

If you are listening on the SYSTEM, you wont hear it.

You can program each repeater conventionally, but this does not require a system key.
 

davidbond21

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Oh ok i was just a bit lost.

Don't sweat it. :wink: My town's public safety is on a larger 32 county wide EDACS. They use I-Call(EDACS name for Private Call) all the time. The town that borders us to the north, uses the same trunking system and radios, but very few of the police are aware of their I-Call capability, and even fewer actually know how to use it.
 
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