Actually I was mistaken when I posted this. The error I am coming back with was UR?WS4VA C.
These cryptic messages that come back to you after keying up on an Icom G2 repeater... they are part of the Icom G2 software callsign routing system.
If you see "UR?" this means your callsign routed transmission was successful.
"RPT?" means that the destination repeater was not found.
A lot of confusion arises due to the different ways that a D-Star transmission can be sent via the internet. The original Icom G2 software only supportes callsign and gateway routing. This means you put another stations call in the "URCall" field in your D-Star radio and your transmission will be sent to the gateway/repeater where that station was last heard.
You can also send a transmission to a distant gateway and repeater by using a slash in the first character of the URCall field. eg URCall set to "/VK5REXB" will send your transmission to my local D-Star repeaters B module (70cm).
Virtually all gateway usage on D-Star needs the RPT1 and RPT2 callsign fields set correctly. RPT1 is the callsign and module of the repeater you are using eg for me it's "VK5REX B". RPT2 is the same but with a "G" in the eighth position eg. "VK5REX G". This is in addition to setting the frequency and offset correctly. There are some exceptions to the RPT1 and RPT2 requirement when using "personal" means of connecting to the internet, eg DVAP Dongle or GMSK HotSpot.
The Icom G2 software is "pushing" your transmission to a distant gateway/repeater. In the Icom G2 gateway world, there is no concept of linking... for a called station to get back to you they would need to set your callsign in their URCall field, this would send their transmission back to you. D-Star radios have a button to do this quickly.
The Dplus (and Dextra) add-on software allows a user to link to other gateways (and reflectors) and this permits easy two-way communications without the need to set specific callsigns in the URCall field. Generally "CQCQCQ " is set and the Dplus software sends the data stream off to where ever the gateway is linked to. This more analogous to how IRLP and Echolink works and also allows multiple stations on multiple repeaters to converse easily... something that is not easily done with callsign routing.
However, the Icom G2 software also sees this transmission and tries to send the call to a station called "CQCQCQ "... as this is an invalid callsign the Icom G2 software will respond with a "RPT?" message, It's telling you it can't route the call to 'CQCQCQ ".
Confusion sets in when you use callsign routing at the same time your gateway/repeater is linked to another gateway/repeater or reflector using Dplus. This makes your transmission head out on two paths.. one via Dplus and the other to the called station (as defined in URCall). If the called station "captures" your callsign and calls you back you will hear them fine... but Dplus will also then bounce this incoming call via the internet back out to wherever Dplus is linked to.
If someone at the other end of the Dplus link hears this call and tries to reply BUT doesn't know it was callsign routed to another station... then their reply using "CQCQCQ " will not make it back to the calling station... terribly confusing.
When I transmit a callsign routed call... I try to ensure my local repeater is unlinked... and I also state in my transmission that I am using callsign routing and that the replying station needs to "capture" my call using the RX>CS button in order to talk back to me.
Dplus is a more common way of talking on D-Star... but a knowledge of how the Icom G2 software works and how callsing routing works is very important too.
As briefly mentioned before there is another D-Star linking protocol called Dextra, this is an open source system that works similar to Dplus. There is a newer linking protocol emerging from Germany called X-Link that allows more robust sending of D-Star transmissions via the internet.
Dplus reflectors use 'callsigns' "REF001 C", "REF012 C", with up to five "modules" per reflector (A,B,C,D &E).
Dextra reflectors use "XRF005 A", "XRF021 B"... also with five "modules"
X-Net reflectors use "DCS001 x" etc. with the entire 26 alpha characters available in the 'x position'.
Probably a lot more info than anyone asked for... but I got typing and couldn't stop!
Michael.
VK5ZEA