[Darkness_]

Turn voiceenable back on
sv_voiceenable 1

Then try this

PHP Code:

#include <sourcemod>
#include <basecomm>

public OnPluginStart() {
    for (new i = 1; i <= MaxClients; i++) {
        if (!IsClientInGame(i))
            continue;
        OnClientPostAdminCheck(i);
    }
}
public OnClientPostAdminCheck(client) {
    new AdminId:adminID = GetUserAdmin(client);
    if (!(GetAdminFlag(adminID, Admin_Reservation))) {
        BaseComm_SetClientMute(client, true);
    }
}