Talk Group Proxying; Talk Group Translation; Private Calls - Futurecom P25 Installation & Programming Manual

8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide – PART II

Talk Group Proxying

The Local PSU User can change the selected 'DVRS Enabled' TG and seamlessly talk to
the corresponding TG Users through the DVRS. The MSU can be on any 'DVRS Enabled'
Mode, which may or may not match the TG selected by the Local PSU.
For example, if the Local PSU selects TG1 while the MSU is on TG2, the Local PSU can
talk to Local TG1 users as well as System TG1 Users via the DVRS i.e. the MSU will be
transmitting on TG1. If the MSU microphone is PTT-ed, both the MSU and the DVR will
transmit on the TG selected on the MSU i.e. TG2.
An outbound call received by the MSU on either TG1 or TG2 will be repeated by the DVRS
to the Local PSUs.
If Proxying is disabled then the Local PSU and the MSU must have the same TG
selected in order to enable Local PSU affiliation and communications.

Talk Group Translation

When TG translation is enabled in the DVR for a specific PSU TG ID, then any call that is
received by the DVR from the Local PSU with this TG ID will be translated to the ID of the
TG currently selected on the MSU's control head.
The Local PSU could be programmed with just one TG ID and if this ID is programmed in
the DVRS TG Translation list, the PSU call will always be translated by the DVRS to the
TG ID currently selected on the MSU control head.
For instance, if the Local PSU is on TG A, which is programmed in the DVRS TG
Translation list and the MSU is on TG B then all inbound Local PSU calls will be repeated
by the DVR locally and to the System on TG B. If the MSU mode is then switched to TG
C then the Local PSU calls will be repeated on TG C.
Generic (non-DVRS Enabled) Conventional P25 PSUs that are not enabled for talkgroup
operation will, by default, use TG ID 1 when transmitting. If TG ID 1 is added to the DVR
Translation table then PSUs transmitting TG ID 1 will be translated to the TG selected on
the MSU.
IMPORTANT!
TG Translation requires that TG Proxying is enabled.
When TG Proxying is enabled and the TG selected on the Local PSU is programmed in
the DVRS Translation Table, the DVRS will affiliate the Local PSU on the TG that is
selected on the MSU. If TG Proxying is enabled but the Local PSU is on a TG that is not
in the DVRS TG Translation list then the DVRS will proxy any inbound / outbound calls on
the PSU TG ID. Outbound call (system originated call) received on the currently selected
MSU TG is repeated 'as is' i.e. without any translation. Therefore the Local PSUs need to
be programmed with Normal Squelch (or NID = F7E) in order to hear those calls.
IMPORTANT!
Encryption Key Translation is not supported by the DVRS.

Private Calls

Private Calls or Selective Calls (Local to Local PSU; Local to System PSU; System to
Local PSU) are supported on 'DVRS Enabled' PSUs only. Generic P25 PSU mode does
not support private calls via DVRS.
January 2019
Page 106 of 153