IMRS

Starting BrandMeister release 20190331-203539 has support of directly-connected IMRS repeaters (Yaesu DR2X).

This allows direct communications between DMR talking groups and SystemFusion radio via IMRS repeater without using any additional hardware (unlike WIRES-X) and with audio quality 1:1. As it is with WIRES-X or YSF bridges, a SystemFusion radio may transmit in DN or VW mode.

Benefits

• Fully transparent calls between DMR and SystemFusion
• Full call signaling support in both directions
• Sound quality is 1:1 in both directions
• No extra hardware is required(*)
• SystemFusion side doesn’t loose any features
• Subscription to multiple talking groups for each IMRS repeater (thanks SystemFusion II)

Conceptual view

Limitations

• Each connected repeater should have unique public IP (limitation of IMRS)
• Due to technological specific up to 99 DG-IDs can be mapped on per master-basis, that means each BM server can bridge up to 99 DG-IDs

Allocated ports

• UDP 21110

Configuration

// SystemFusionII Repeater with LAN Adapter (IMRS)
FusionRepeater :
{
  // UDP Port
  port = 21110;
  // Call of local "repeater"
  call = "CALLSIGN";
  // DP-ID of local "repeater"
  serial = "xxxxx";
  // IMRS TOT Timer (seconds)
  interval = 60;
  // Subscriptions to groups
  subscriptions =
  [
    // <DG-ID>, <Group ID>
    1, 2501,
    2, 9504
  ];
};

Issues with connectivity

DMR radio (and Last Heard) shows talking group number instead ID of operator

• Operator has not registered his call-sign in CCS7 registration system - ask him to register
• CRC check failed during processing of SystemFusion

BrandMeister log entries

When a Fusion Repeater Successfully connects BrandMeister Server

New regular connection of Fusion Repeater (xx.xxx.xxx.xx)

When a session begins from the Fusion Repeater to BrandMeister.

New session a5dcb300-09b6-4fad-8a15-6b0ba61c9f6b of Fusion Repeater system 0 at slot 0
Forwarding System Fusion II call xxxxxxxx (CALLSIGN) to DMR group xxxxx (DG-ID xx)

When a Connection from a fusion repeater connects to BrandMeister and or resets a connection.

Connection of Fusion Repeater system 0 (xx.xxx.xxx.xx) expired
Connection of Fusion Repeater system 0 (xx.xxx.xxx.xx) removed
New regular connection of Fusion Repeater (xx.xxx.xxx.xx)

When a call is originates from BM to Fusion. At this point this is generic but does show activity going is going to the Fusion Repeater.

Added route to Fusion Repeater system 0 at slot 0 (locked) by Fusion Registry