According to Tohru Yamashita of Asian Broadcasting Institute, South Korean cladestine station (to North Korea), by South Korean National Intelligence Service, "Echo of Hope" has been using the announcement "This is Echo of Hope from overseas compatriots" to conseal the original broadcaster.
But since May 3, 2008 the station has announced the station name as "VOH" in the end of each program. Since July 4, 2008 the announcement as "This is VOH Echo of Hope from the General Union of Overseas Compatriots" has been used.
As there is no such a group named "General Union of Overseas Compatriots", this seems to be a fictitious group. "VOH" seems to be an abbreviation of "Voice of Hope", which is the same meaning as "Echo of Hope".(Takahito Akabayashi-JPN, via wwdxc BC-DX TopNews July 6)
(Source: WWDXC Top News -BC DX #868 via wb, Germany)